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Re: Third Reef or Storm Sail?
I use a triple reefed main ... and there are some considerations worth discussing, here.
Unless the main has already been constructed 'robust' for 'offshore' work, you do risk vulnerability. A try'sl will usually have wide overlapping seaming which are triple stitched and will/may have panel seams reinforced with triangular patches along the leech section for extra 'robustness' and to prevent 'the splits'.
FWIW, I build my own sails.
My triple reef main is triple stitched with the seams overly broad to better distribute any adverse wind loading. The seams are also 'glued' (PECO tape).
This is a cross-cut sail with all the panel seams reinforced at the leech / aft end with triangular patch reinforcements to prevent panel separation ('the splits') that usually starts at the leech end. The sail has an 'over-the-top' leech line system ... which makes the leech purse line equally adjustable from the normal leech / 'boom end' OR from the base of the mast .... so I dont have to 'hang out over green water' to adjust proper leech tension. Improper Leech tension is probably the cause of most sail panel/cloth failure ... leech flutter between batten stations along the leech, usually between battens #1 & #2 where the roach has its largest 'curve'.
The largest problem when triple reefed is the large amount of 'bunt' on the boom and the large amount of 'slugs stacked up' at the bottom of the mast slug track (even with the addition of 'slug jacklines' along the luff (usually found only for the 'first' reef position)... so that your not able to get a 'direct' line of force to properly operate the outhaul and needed foot tension ... the 'stack up' of slugs at the mast base requires the tack cringle of the third reef position to be FAR above the gooseneck and really requires that the third reef tack be 'additionally' tied to the mast to oppose outhaul tension (and at an angle).
Other - If you have rigid boom vang, can you up-angle the boom aft end sufficiently to match the third reef clew elevation to be somewhat equal in elevation to the third reef tack position now sitting high above the gooseneck because of all those slugs on top of one another at the mast base? Or does the sail's 'third reef' configuration already include the angled geometry (clew, reef points, etc.) to 'clear' all the 'mess' now tied onto the boom?
A properly built trysl doesnt need all these 'alterations', has a 'reversed' hollow leech for simple (automatic ?) leech tension control, etc.
A triple reef main is quite a 'bother' to set up and unless your main has been constructed with the proper panel/seam/leech 'reinforcements' as discussed above (or that the upper panels at the head of the sail are already built of the proper heavier weight cloth and seaming, etc.), its probably much simpler and easier and less 'fuss' to carry and fly a try'sl during those very few times you're going to NEED it.