Pushing acros 2 stops in 35mm

[Poisson Du Jour]

ACROS will not show much of a change at EI400 with no change to processing. It is very stable with a big latitude; more change noticeable at EI800.

[polyglot]

It'll do 200 easily in Xtol 1+1. 400 with a bit of a push I'm sure.

Rodinal 1+100 semi-stand might work, but it has the stand-developed look that you might not like. Rodinal with normal agitation will do quite poorly.