I also start at 120 grit. Personally, I think starting with 100 grit risks scratches that the higher grits won't work out, as has been said above.
Almost all of my sanding is done with my Festool 150/3. So not changing sanders. Suction turned down most of the way. Start against the grain, then diagonal, then with the grain. Seems to work and not leave swirls. I fortunately haven't faced this issue.
- After I ask a stranger if I can pet their dog and they say yes, I like to respond, "I'll keep that in mind" and walk off
- It's above my pay grade. Mongo only pawn in game of life.