I don't think the sail has a bolt rope sewn in under the tabs for the slugs, although I could be mistaken and just not paid attention to that.
If your mainsail is cross cut, woven dacron, 99.9% of the time there will be a boltrope to control the luff stretch and to make the luff 'stable' in varying wind strengths.
I do have a boom, it's just configured as a wishbone boom.
In the context of 'sail shape analysis', your (wishbone) boom configuration doesnt help.
When evaluating a sail on a conventional boom, all one has to do is look at the tack angle in the data book, the listed tack angle is from the OEM boat designer. ... the tack angle, the 'designed' angle that the top of the boom makes with the mast, sailmakers are VERY careful to have this angle very precise when making sails. In such analysis a (good) sailmaker will usually always 'start' the analysis by properly raising/loading a boltroped mainsail to see if the tack angle is correct when the luff is 'loaded'. If the databook tack angle is not observed, then the sailmaker KNOWS that the dacron sail will have serious faults in sail shape.
Most mainsail 'tack angles' (luff to foot angle) when the sail is properly raised allowing the sail to be 'stretched out' to its intended dimensions will be in the range of 87° to 89° for 99% of all boats. You cant do this with a 'wishbone rig'.
I"m not following the comments on avoiding cranking the mainsheet. I do not have a traveler, so the mainsheet positions the boom. Because the sail is set more like a genoa, the boom is generally not brought in over the past the coaming, certainly not to the center line. And the bendy mast is designed to automatically spill gusts, which does work. Still, I get that have have a bit less control over sail shape then some sloops.
Your mast is freestanding, there are no wire stays to resist your mast from 'bending'. When there is little to no wind the mast will be essentially straight up; when the sail is fully loaded or overloaded the mast will bend, significantly and especially towards the stern; the top of the mast and the top portion of the mainsail will now be 'relocated' towards the stern. The overall CE of the mainsail when the mast is 'really' bent is now much further back than when the mast is 'straight up' or unbent. Shifting the CE rearwards will increase 'weather helm'. When the mast bends back the leech will become 'more loose' (tripped); but, if you now tighten up on the mainsheet, you will remove the the flattish shape of the leech that the mast bending caused ... Tightening up on the mainsheet with a very bended mast will cause the leech to 'close' become 'rounded' and which will increase the overall amount of draft if you get too carried away with mainsheet tension.
The only way on your boat to 'rebalance' the CE is to apply 'luff tension' which causes the point at which the maximum amount of draft occurs to 'move forward' with increased luff tension; moving aft when you release luff tension. Also increased luff tension will also cause the leech to become 'flatter' which will also reduce the 'amount' of overall draft in the sail.
Overtensioning the mainsheet, will cause the leech to again become more 'rounded' (less 'flattish'), and will cause the 'overall' sail shape to increase the amount of draft. Most sailors radically overtension their sails - leads to 'sail shape' problems and causes permanent 'stretch' in the fibers and films. Overtensioning
the mainsheet adds to even more mast bend ... and more of the CE going 'aft'.
I have wondered if the mast could be raked forward just a bit and if that would move the CE enough to affect the weather helm.
Simple rule here w/r 'weather helm': ... rake the mast ONLY
after you have absolutely concluded that the sail SHAPE is perfect and is taking the shape that the sailmaker designed into the sail. Most 'weather helm' problems in well designed boats (yours is) are usually sail SHAPE problems, and usually because of insufficient luff tension that allows the 'point of MAXIMUM draft' to occur too far aft in a sail.
I make the claim that on 99% of ALL 'cruising boats' that folks simply dont correctly raise their boltroped sails .... you can SEE this by the position of their booms when 'beating' - the aft end of the boom is usually ALWAYS lower than the gooseneck. (If I see this on a competitor on a racecourse, I KNOW that this boat will NEVER catch me during a tacking duel to weather and I look for the 'next' competitor that I have to 'conquer'. )
The info I offered here about correctly 'raising' woven dacron sails is also found (different wording, etc.): How to properly RAISE a woven dacron mainsail - SailboatOwners.com
Lastly, you'll never have good 'trim' if your sails are incorrectly 'shaped'.
I keep my boat at Worton Cr. on the Ches. directly across from Middle River. Ill be returning from sailing 'de islans, mon' in late spring or early summer. If you wish and Im available, perhaps we can get together and 'evaluate'. You can send me a PM to remind me.