Used 943's before, it's a proven spring in my opinion. I usually set them up at 1.88-1.90 that covers rollers in the .650-.690 range. Check for "x" pattern on the valve tips. sure sign of valve bounce /float.

Just so we get a good look at this.
1.95 installed height.
minus net lift say .610
equals 1.34
minus coil bind 1.16
equals .180 from bind
That's too much in my opinion should be .06 to .09 to make things happy.

This relates to valve spring set-up you could be having other issues. would be interesting to hear your results from a valve spring shim-up.