Raise as much as you have to. The more people are willing to call preflop with bad hands the easier it will be for you to make money. Think about it this way. If you hold QQ and you know that if you push, any A and any PP will call you then youd push right? Just raise how ever much it takes to cut it down to a few callers (who are calling with worse hands). Alternativly you could try counterplay and see how that compares.