Hey, I've been vacationing, sorry to drop the ball on you there. I had a chance to look over a 14 turbo and had a couple thoughts/questions for you.
mast rake should also induce mast curve to some degree. This tends to work optimally when you set your side stays with the mainsail up. Do you set your side stays with your main up?
How much rake do you have when you go back and lengthen the forestay? I mean, from the vertical, how far does your mast lean? Too much rake can be detrimental to tacking and also cause excessive weather helm and loss of drive. One of the reasons for rake is to help lift the bow of the leeward hull, but it doesn't take that much rake to help.
Try this: With the furling drum at an "appropriate" height, and side stays loose raise the mainsail and lock it. Then set the traveler to a corner as far out as possible and crank down the mainsheet enough to loosen the stay on the side that you are pulling toward. Do not set the stay down as far as you can, just lower it a hole or two. Then go to the other corner and do the same. Repeat back and forth to take up any slack evenly on both sides.
NOW how much rake is there? I don't think that you can really over-tighten the system. We used to really reef on our 16's and 14's almost to the point of guitar-strings- also not good- but we never broke anything. Well nothing on the boat-
Steve to Steve- let me know if this helps