I think the workouts that you are doing sound great. With the squats and the chest press try doing 3 sets of 10 reps and find a weight that you are comfortable with. If that's 30K then awesome - as Hoobley said you will not bulk up by doing heavy weights unless you are taking something like a steroid.

You haven't said how often you do each thing - just remember to take at least one days break between Pump classes - do not do them on consecutive days, you need to give your muscle time to repair.

And Hoobley - OMG to your instructor pressing 50K in chest during Pump - that is insane!