Ok, the thing is it only bogs the motor down on the last 1'' of travel of the sticks when going forward or backwards (so if I let the sticks back to 3/4 travel it does not bog). To me it feels like it is over pressurizing somewhere? (like a pressure relief valve has come out of adjustment). Is this a possibility in your opinion? How many pressure relief valves are there? All other functions work fine, moves forward, back, up, down, open, shut, turns, just bogs down when sticks are full forward or reverse up hill. Really appreciate any feedback. Thanks.