Couple of suggestions...
If the paint is fresh then it will be easier to work your sanding marks out by hand versus if it were factory baked-on paint.
You can always start out with a piece of 100% cotton to give the M105 more bite or abrading power and then redo the area using foam or microfiber
I've removed #2000 by hand using M105 and terry cloth on factory baked-on paint so you should be able to repeat this on fresh paint.
Get a piece of #2500 or #3000 Nikken and use this to reduce the initial sanding marks to be more shallow.
If you have it, use the Abralon #4000 grit by hand. The foam backing acts a little like a backing pad to spread out the pressure from your fingers.