CPU: 10700kWhat are your full system specs?
It almost sounds like the type of performance problem you'd have running an Intel system in Gear 2, but that very much shouldn't be happening with these low DRAM speeds.
I’ve set the XMP profile then manually adjusting the timing after that.Yeah Gear 1/2 isn't a thing on 10th Gen so that certainly shouldn't be the case. When you set it to 2400/3000 were you just manually setting the speeds? If so have you tried manually setting 3200 instead of just using XMP? While XMP shouldn't be a problem there is an outside chance that this may be the core of the issue.
The numbers you're seeing with the "slower" setup seems close to what you should be seeing.