I had the same set up on a 20' mini cruiser, except with only 1 fuel feed per carb. I am no carb expert, but can't imagine why you would get flooded out at full throttle but not at cruising speed or idle. Do you have a mechanical or electric fuel pump? How about a fuel pressure guage? Although, the TR looks good, when I replaced mine with a single carb performer intake and an 850 holley, I gained 200-300 rpms and top speed, and improved fuel economy by about 20%.

The fuel pump is a Holley blue electric. pressure is set at 8psi which by reading info on the Holley web site is too high they it should be at 6psi. I just order the rebuild kits today. I'm gonna try blocking off the second port, lowering the fuel pressure down to six (I think the pressure was holding the needle valves wide open)... I'm very stumped about the bogging at WOT, its only the last 10-15% of throttle it bogs like its flooding, i know its running real rich the plugs are black and the pipes have a lot of black soot. Don't have a clue as to it idling good and it runs like a bat outta hell till it hits WOT then it bogs out and I have to back out of it.... Gps at 66mph rite before the bog