Your problem lies with worn parts. Starting with ALL the linkage and all the way down into the gov. Rebuild repair all the linkage and then ya get into the Gov. And once inside you will find that the spring has a bunch of slop in the holes of the arms inside , there is suppose to be hardened bushing in them big holes and NO slop . This past summer i rebuilt a friends 400 and he could not believe how much better it runs now. His kid was running my S/MTA and said how fast it responded to the throttle and he wished the 400 did that a few ours later and a quick trip to the machine shop to rebush the inside gov. arms it now only move one notch before something happens.
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