A certain large British helicopter operating company that used to have a training school with R22s ensured that the autorevs at min collective pitch were set at the high end of the permissible band. Dual autos required a touch of lever to contain NR in many circumstances, but for solo student practice autos (NB EOLs prohibited for students solo)the NR would be comfortably in the green arc when settled in auto.
A good practice, commended to any other training organisation using R22s.