Hi Doug, I also live in the mountains in northern British Columbia and sail very large lakes with gusty winds in a prevailing west to east orientation. I had a 140% genoa on my Schaefer snap furler and found it was fine. But, I just purchased a new main and fantastic 150 from Yager sails out of Spokane.in 5.5 oz Egyptian cream dacron. Don did an excellent job and placed reefing marks at 130, 100, and 90%. Larry Yake has had a number of his sails made at Yager and so he might pipe in as well. He also sails on gusty mountain lakes. I went with the new main and 150 to get back to the proper sail plan which Lyle had designed. My old sails were cut too short and so I wanted to get them up into the best wind near the masthead. Sorry , long winded but, I am happy with my 150. ...M17 cerulea #32