I think that for a mass gaining phase, you would be better off with long acting gear. It builds up much higher in your blood stream and produces more gains, IME. I would suggest somthing like Sust 270 and if you want to use NPP, that will work finr.
Sust 270 .5cc EOD
arom 12.5mg EOD or more as needed
NPP 75-100mg EOD
No need for t3. AT3 wil only burn calories that could be used for muscle gain. If you want to avoid putting on too much fat, make sure that your cals are close to being above maintance but not way over and use small amounts of cardio to keep tigher.