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Join Date: Sep 2005
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Getting rid of the high friction blocks will make a big difference, and as Jeff says going to 6:1 is overkill on a 30 footer.
But you could add a small 3 or 4 part tackle where the bitter end of the sheet attaches, and use that as a fine tune - you'd only get about 8-10 inches more travel, but at 12 or 16:1, there should be no problems getting the last few inches of trim and you won't have miles of sheet on the cockpit floor.
I've got this on our large-mainsail 34 footer, and though it's marginal for our boat it does work, much better than the undersized 4 part that the boat came with.