I've vascillated like this a few times as well, but not at D2. Looking at your squad, I think you can pull it off, as most of your guys have DE > 50.
However, I've come to the subjective conclusion to pick a defense and stick with it. With the HCP/MM option, I just never seemed to find that I was getting enough impact for so many minutes of defense practice. Whereas, if you even put just 30 minutes (10 less than what you're doing now) into either Press or MM, whichever you choose, you may be better off. Even with potential and hard ceilings, my conclusion has been to just stick to one defense and get those IQ's up.