Two part question:

1. There is an old thread I found on here that discussed how the new Portra 400 is very sensitive to magenta shadows if the processing is not just exactly right. I found this to be true, as I developed 7 rolls of it plus one roll of Fuji 400H in the same tank a couple of weeks ago using my Trebla chems. Shadows on the Portra rolls have a strong magenta cast, but only in the shadows. The Fuji roll in the same tank did not have this problem. So I got to thinking, what are the most robust and forgiving films for small time/temp deviations/mistakes in home processing?

2. Pushing! What films (any speed) yield the most stable color when extending development? I'd like to avoid any weird color effects, and just get a higher contrast neg. Other contrast-increasing methods welcome here too.