forestay tension
It's not the tension that counts. It's how much mast rake you have, i.e., how much it leans aft. The proper rake is 6". You find this out by getting the boat level (in the water or using a surveyor's transit on the boot stripe, and letting the main halyard dangle (remove the boom). Make sure it's centered side to side, too and that you have the correct tension on all the side stays. It's a balancing act for sure, but once it's set, you're done - seize the forestay turnbuckle and forget it.Lots of stuff in the archives about this and about side stay tension. I set my side stays at 220 and 440 (lower/upper). Others go higher, few lower.