I would like to build my roller furler but have not yet recieved my Ariel Class Manual which I assume hase a tuning guide nor have I stepped the mast. My forestay measures out @ 32'6" with the turnbuckle at its midpoint. What should be my target lenght? I'm thinking uppers and forward lowers @ about 22 on the Loos gauge or 460lbs, aft lowers @ around 18 on the Loos or 380lbs with 2"-3" prebend. Am I close? Any other tips?