02 700 Poor climbing power – awesome downhill power

So,, Long story short I have a 02 700 that I love, but if I try to go above 3/4 throttle going up any type of incline (even sometimes on flat ground) my machine bogs down terribly. to the point that I have to come to a complete stop and then return to 3/4 or less throttle before it will perform regularly again. But if I keep it under 3/4 throttle it works fine and I have enough power to climb hills and do whatever else is necessary. I noticed that on the way down it performed great, even full throttle. I recently had the dealership do a carb job on it and a bunch of other stuff to fix this problem but it still does it. Im guessing its a clutch issue.. do you think Im on the right path? thoughts or suggests?

Thanks guys!

The Gee