I am about to try TMY-2 in 35mm. I am planning to run tests on exposure/ development along lines of David Vestal's method - 4 test rolls, each with a series of exposures from 5 stops under to 5 stops over. One roll at recommended development time (Rodinal 1:50 for me), one roll at twice recommended time, and one at half. Forth roll held for fine tuning.

My question: TMY-2 by many accounts is very reactive to changes in development. Will twice and half development times take me too far out, even for push & pull times? Should I initially test at perhaps recommended and 1/3 over and 1/3 under? (I am interested in push and pull times as long as I am testing.)