clutching question

To some of you guys with clutching experience. I’m getting a lot of clutch heat running at high speeds. Enough to deform my snorkle a bit. I’m running 27 inch outlaws and about 350 lbs of people cargo. I’m assuming when running 6800-6900 rpm there’s too much load on the secondary and to fix that I’d need a bit stiffer secondary spring. If I went to lighter primary weight to bring the revs up I’d think the heat would be greater because of less squeeze and slippage? Just wanted a second opinion in case I had this all backwards in my head.