To be fair, Fast played 9:40 tonight and since Jan 1, he's 12th among forwards for TOI/GP at 10:46 (of 1 of that is on the PK). He's being used exactly as you stated.
Staal was 8th among forwards tonight in TOI with 14:42 (of which 1 min. was on the PK), so he was used close to what you stated. That said, he's 6th on the season among forwards for toi/gp though, but much of that is due to others not being good enough to take more TOI away.
I'd love for him to be in the 10-12/game+PK time, but I think this falls into the "able" category.