Lots of folks who stop by here use Aspire, so wait a bit for experienced comments.
I do not, but would suggest you try
G Code ARCs (mm) (*.tap)
I see a lot of folks who use Aspire generating G code with just linear moves, lots and lots of them.
I am assuming G Code ARCs will include G2 and G3 arc commands, which tinyG does well and minimizes really short moves.
Or, better yet. try the same (short) job with both G Code(mm) and G Code ARCs (mm) and compare results.
mm or inch should work, I just personally prefer mm.