Overlooked Pointing Factors
I assume you've run through the normal sail trim combinations when sheeted in and going to weather. If you can reasonably sheet in close to the spreaders and shrouds, perhaps adding a couple rows of telltales 4 to 9" back from the luff at three heights up the lufff, will show you when the jib is trimmed best. A 135% genoa typically won't sheet as tight as a#1 or #3 because the genoa lead is close to the shrouds. Let's assume the main is reasonably flat and not backwinded; its halyard tension is hand tight with the outhaul medium tight and the main does not have an overly tight or hooked leach. Let's assume the rig is centered and adequately tensioned so the top of the mast is not falling off to leward, or the headstay is not sagging more than 3to 5" to leward. If you have a fixed prop on the boat, ideally it should be aligned vertically when sailing, but in any case , shift the transmission into reverse so the prop won't freewheel and create more turbulence in front of the rudder. If nothing is improved at that point you might have a sailmaker look at the sails to see if they need to be recut. Often a too tight leach on either the jib or main is causing the problem. Good Luck!
