If 5 people will call 5xBB, then I don't see why raising 10xBB plus won't scare 4 out. If that does not work then bump it up higher. Even fish are smart enough to fold QT to a 10xBB raise. If not, please call me immediately so I can join the table.

By the way, QQ and KK will lose at a high rate with 4+ callers too. Unless you hit trips, you will get outdrawn or an Ace will pair. So, the solution for all your power hands is to isolate. The only way to isolate is to bet higher than they are willing to go.