I rated the film at 100 as you are not supposed to lose film speed with pyrocat HD. For shots that were questionable to retain shadow detail, I erred on caution and gave an additional stop of exposure. Highlights were contained no problem.
Thanks for the info! The reason I had asked was with some films, JandC Classic 100 and one other, I noticed that I needed at least one additional stop if not more. Wasn't sure if it was going to be the the same with Acros.