Quote Originally Posted by stradibarrius View Post
TMAX 400 in R09
Scanning... Check. 35mm size film... Check. 400 ISO film... Check. Rodinal... Check.

You pretty much created the recipe for grainy pictures... Well besides using TMAX which is pretty fine grain for a 400 ISO film. Every one of the things cited will contribute to grain. Try XTOL with TMAX 100. Or XTOL with TMAX 400 in 120.