I switched my stock 2005 Corvette from 5W-30 M1 to PP just before the M1 wear fiasco.
I've always been pleased with Pennzoil's performance in all my vehicles for over two decades.
It's only natural I would use PP in the 'Vette.
Both M1 and PP are high quality oils.
Your mods on your Z06 may, however, bring out the worst in any oil you select.
If M1 has been working well for you, why change?