Start back at the basics first
Patrick, the most common mistake that I see on the race course is the temptation to overtrim point too high. I have seen time and again, people round the leward mark, and with no regard for the conditions, trim in their sails too tight, crank on the outhaul, cunningham, and backstay, stick the bow up and drive the telltales looking for point. The boat slows down, the keel loses its lift and without knowing it you are going sideways. The old addage of "when in doubt ease it out" holds true here. As long as you are sailing at max speed and keeping the boat flat the keel will do the rest - or at least all it is capable of doing given its design and condition. As your speed builds again you can begin to trim in and try to get more height, but only to the point that you don't begin to lose speed. At this point minor sail adjustments can become very important depending on the level at which you are racing. But you can't worry about that tenth of a knot unless you are sure that the basics have been addressed first. Aside from looking at your sail trim with respect to the conditions, you should make a point to see if footing off for a little more speed helps your pointing. Don't over do it though - we're talking about putting the bow down five-ten degrees and easing sails to the tune of inches. Another good idea is to have a competitor go out and sail against you on their boat. Point with them, keeping the boats close together and in the same breeze and play with your sail trim and steering to see what works and what doesn't. Then make a note of the sail trim settings for those particular conditions. Remember steering is a huge factor too, especially in waves.All the rest of the stuff about mast rake, lengthening to your forestay, faired bottoms, folding props and new sails are definitely factors to consider, but you don't want to start tinkering with these things unless you are confident that you and your crew are racing at a level where the inches gained will make a difference given the costs of some of these improvements. Also, you need to be sure that you are comparing your performance to other similar boats. If you are racing with cruising sails on a boat with a wing keel it would not be realistic to compare your performance to a J/35 with racing sails, adjustable leads and a 7' deep fin keel, even if he is racing in your class. I know that my example here might seem obvious and, of course I am exagerating a little to make the point, so a more subtle comparison might be your 33.5 vs. a S2 9.1. The boats don't have a huge PHRF rating difference at +/-15 seconds/mile, but the difference in performance is huge. The lighter boat will accelerate faster, and overall outperform you in most conditions.Best of luck and don't get discouraged.PS - Alan, what do you mean when you talk about the cap shrouds being at 25% of breaking strength? I have never heard anything like that and you have peaked my curiosity. If you get a minute, can you explain what that means, and how you actually measure it?