Thanks for the tips.
ECPSVM was/is turned on in the Hercules config.
I did add the other 2 CP commands after IPLing MVS and it did make a small difference.
But overall, I seem to be suffering the expected challenges that @Tony elaborated on in his response.
@Bob, in one of the Moshix videos, a couple of patches that you have for TK4 under VM/370 were highlighed.? Have either of those been validated vs. TK5?