OK, so the recoil effort did not change before and after the water pump work…
Gear oil looked “OK”, no evidence of water….
You seem to indicate that the engine runs fine, so I’m inclined to advise not to mess with it further. I surely don’t want to advise ripping the gearcase apart only to find nothing wrong….I would continue to use the engine and change the gear lube frequently….Any signs of water might spell trouble…
Again, the usual symptom of a swelled shock spring is that the engine struggles/bogs/stalled when run at high speeds…Correct me if I am wrong, but you don’t seem to be experiencing any of these symptoms….