I have (almost) all the lapping done.
There are 3 valves that i have left to do. 2 exhaust valves in cylinder 5 (cylinder that had low compression) and 1 in cylinder 6. i am definintely going to need 1 new valve for cylinder 5 since i cant work it down enough, and the other ones will take quite a bit of work. this definitely confirmed my belief that this was the issue.
This is the valve i will need to replace. After 30 min of lapping and its still only working the one side: