Yes I know it took forever to get those washers changed but I did it today
Oddly enough the hot water faucet that was thumpin was the only one (i replaced all washers from all the handles on this sink) without the screw at the seat, There was a post the washer sat on and in the valve i could see another post. The sound is mostly done except if you slam the faucet on, if you open it not slow but easy it will not make the noise, i am wondering if i got back in there and put another washer on that post inside the valve, would that take care of any noise. Good news is it doesnt leak through anymore either .
After replacing all washers on that 3rd knob in the middle, it still doesnt seem to do anything, though you can feel the water pressure when you close it down. Odd.