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Another way to check the reed valves is hold the plate up to a light & then you can see how much light comes thru the gap on the seated reed plate & reeds. Should be iniform light thru all the reeds & figure fuel / oil mix would seal the reed to the plate. I too think your first rebuild kit being faulty. Brings to mind I trouble shot a windshield wiper motor that was a rebuild & it wouldn’t turn off. Did a inspection to find one wire wasn’t soldered in place. Now I never assume the new parts are accurate & comare to parts are removed. Also inspect the neeedle & seat with a magnifier glass for sloppy machining. I have repaired the seating surface using valve seating compound, not the best fix but I couldn’t find a replacement part. Good luck with your project & look at everything closely for fit & finish.
What condition does your spark plugs look like? Fouled plugs tell a good report of events in the combestion chambers, one fouled or different that the other?