Proper Strategy with 3 left in Mini-Step?

[DoomSlice]

I made it to mini-step 3 after fighting through 1 and 2 a few times, and eventually ended up with a 5000-1500-1500 lead over my competition.

Since only places 1-2 move to step 4, I figured that neither of them could call any raise, so I started to move in EVERY hand preflop (blinds 100-200).

Is this proper strategy, or should I have toned it down a little?