Well I have just started paddling this summer in a old Coleman 17' tank but just upgraded to a Old Town Guide 147. I had problems with the Coleman as I couldn't set on the seat with out tipping so I set in bottom. I am rather large 6'3" bout 380# so I lowered the seats in my old town about 9" is there anything else I can do to help with this issues. I have had the chance to try it out yet in the Old Town.