You should be fine kayaking on the TFF. Is it big? Of course. But it A) sounds like you've been doing this and are well prepared and B) are planning on camping and exploring and therefore probably won't be 3 miles across open water with a storm you didn't see coming keeping you pinned against rocks for 8 hours. As long as you're aware of the weather and don't try to cross a large expanse in 30 mph winds, there is no reason the TFF shouldn't be a great kayak-fishing lake. ss4o9 seems to be pretty successful at it up there.