Cam swap ,i guess im living right

I think the locks come in sets of 8, so you would have to buy 2 set to do them all. I say, replace them all and pay real close attention to that retainer that has only one lock.
You could have a 10* lock on a 7* retainer........or you could have a cracked retainer.........Alu retainer are the ones that have that problem most of the time.

Look to see if there is any height difference in the top of the valve stem compared to the retainer. If the keeper is recessing into the retainer, this could cause low spring pressure and cause the valve to bounce/float at a earlier rpm.