When people shoot off with "I run bla bla bla plug in my small block"... immediately put them on ignore... jk but seriously, to hell with THEIR small block, this about YOUR small block, RIGHT??
Try one heat range cooler, in YOUR case IF you find you can't quite tune it out with a timing adjustment.
Good luck, I still think a little more coolant flow at low speed and 2-3 degrees timing taken out will be enough, if needed.