Sounds like you weren't that far out(count your blessings). I still would want to have it perfectly even side to side. and to know what the actual tension is. If for instance the rig is equal but only tightened to 8 or 10 percent, you wiill still be putting a shock load on it when you jibe or tack in 20+.
Get the loos, get it equal and start racing that boat. with speeds like that you would whoop every boat at our wed. race hands down.