Depending on which end of the spring you moved, that may or may not have been good. If you moved it on the throttle side, fine. If you moved it on the governor side, it will change the governor's response to load. You can really affect running if you moved it on the wrong lever, the wrong direction.
Hydro's whine. That's normal. Change the oil and filter if you haven't. No relief valves on the hydro. The big cartridge valves are just charge pressure check valves. Everyone calls them the wrong thing. They ARE NOT relief valves. That hydro has no main drive system relief valve.
Spend your money on some lug tires for the rear and fluid fill them. You don't want turf tires on hills. You will end up sliding down them. Lugs won't tear up the yard.
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