Is the engine speed going up and down, or are you just hearing a change in motor sound as the governor supplies more fuel under load? If the latter, that's all quite normal. (Exhaust sound does not necessarily equate to engine speed.) If it actually speeds up or slows down under a STEADY load, there is a screw on the front of the governor that adjusts the bumper spring to smooth it out. That probably is not necessary if the only changes you hear are when the load changes.
Your question about the fuel filter will generate some comments both in favor and against. It sounds as if you tend your fuel system well, and I really doubt that fuel supply is contributing to what may or may not be a problem. If you do want to try a filter, talk to a good counterman at your auto supply. It's important that you have one that's made for a gravity feed system. Putting one made for a pump-supplied fuel system on your tractor will only create a restriction in the line and make for a whole other set of undesirable symptoms.
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