Keep the sail
I own a H34, 1984, that came with a 110 roller, 135 roller, and a 145 roller, and the original main. Since our intent was to race, I ordered a new Main & 155 set up to slide on the twin groove harken roller unit but not to furl. I use the old main and 145 to cruise and for racing the new 155, new main and the 135 as a #2 and the 110 as a #3. I do not use them in a roller capacity when racing. Reason is when the 155 goes on I have to drop the roller furling unit at the head of the sail down and out of the way. You probably should look at your mast rake & tunning if you are getting massive weather helm at 15knots true with a 135. Also check your back stay & tighten it up to reduce headstay sag, as well as flattening the main. Upwind with 15k true or aprox 20k appar. is about the max we fly a full main & 155, & we are at our designed heel of about 22 degrees. My polars show close hauled at true of 16k, 20 k appar., @ 32 degrees appar, with a speed of 6 k and heel at 22 degrees. 18-20k true is time to start shortening sail.I don't bother with the 145 as the step down is to insignificant for the time to do it and the sail was used alot by the previous owner and is baggy. Roller furling sails loose their shape/pulling power etc when you rollup past about 15 to 20 % points. Not saing you cann't make do vs changing a sail, its just their not as efficient. Have several sailmakers step on board & go for a sail so as to look at your sails under load. Pick their brains as to why their product is better than the competition & be sure to be specific about your goals, deep pocktets etc. and ask how they would move you into additional inventory. Then step back & review who is selling sails & who is looking out for you. One thing about adding UV protection to your sail on the foot & leach. The usual blue & brown etc are heavier material than a white UV protector cloth. The white will help sail shape in the liter winds. See if your sail maker knows that one, although on a 110 you won't be using it in lite winds. Hope this helps.BOLSincerelyPJ