I would do 1 mg twice a week. You want to cycle it 12 weeks on and then 12 weeks off. You don't want to take it continuously, and then you can use it when you get sick as well.
@mobster That's definitely someone who knows how to push themselves in the gym right there. I got to get me one of those shirts, as I'm definitely part of that club
You can certainly stack them together. A lot of people will worry about slamming your estrogen but at the end of the day, when you're cutting and you want to harden up, that's kind of what you have to do anyway.
When it comes to powerlifting, making the switch is not a bad idea. I would stick to the compound movements, the big lifts like squats and bench press, for example.
You really should look into some fasting protocols. Fasting is a huge game changer. It will boost your glucagon in your body and increase growth hormone as well.