possibly found the problem everyone please read
If not, could be elsewhere, such as in the oiling system, etc.
Does the rpm fluctuate when the oil psi does? [Engine misses, rpm drops, oil psi goes with it.??]
Did the issue stop when you repaired the broken spring?
I think I look at that, as a way to assist in determining need for further inspection.
Cut the oil filter open, take a look. See any junk when draining the oil?
A leak down should be done, to make sure there's not a bent valve.
No guarantees though a friend let a set of springs go 2 years on a daily driver they were down like 40lbs(he knew they should be once a year), puts a new set in and one breaks at 30miles, then at 130miles another one takes out the motor, at low speed. Was a $400 set of springs and the same ones he had used last time. Quality brand with extra treatments.
You can't just put in a big cam and drive indefinitely.

