If the compression is low, readjust the valves before doing anything else, and recheck the compression.   With the higher oil pressure the hyd lifters may react differently.  They should not, but those are not new, and you never know.

Let us know what happens with the new wires, etc.

Thanks Ken, Haven't had a chance of late.  It's winter over here and some long sought after rain has arrived after a dry spell of 18 months.  As soon as I get a chance to do some more work I'll let you know.