(2)450 DP's vs (2)750 DP's

MomsDuster said
16+ with a noticeable surge

Yeah, if it’s surging it’s lean.

Just remember the leaner you can run without surge is where you want to be, regardless of what the AFR gauge says.

If it will run without surging at 15.5 or 15.0 or whatever, the leanest you can run the better.