In the 4th week increase the dosage from 10 to 20mg. That is a pretty long cycle and you will def. be completely shutdown. 10mg won't do much for you.
As pitbull stated a cortisol blocker is always nice. I tend to use Lean Extreme as I am a fan of Designer Supplements products. Any of the saponins will do you good, whether it be fenugreek, tribulus, etc. They are all pretty much the same in efficacy in my opinion but they are more for libido purposes than anything else.
DHEA at 250mg for 2-3 weeks is another great way to go. DHEA won't do much for younger males in that our levels are so high we would have to take in around 1g of it to see a significant change in test levels, however, in PCT test levels are that of a 70 year old man so it does a lot of good here.
Again pitbull stated ZMA, which is basically zinc/magnesium. I would go with 500mg magnesium and 25mg zinc before bed.
Actually I just realized you are using powerfull, with that being said you don't need to buy trib or any of the rest, powerfull in my opinion will pretty much take care of that side of things, and i have heard good things about powerfull in PCT.
Some people like to use AI's (ATD is an AI if you didn't know) in PCT but I am definitely NOT a fan of it. Taking away too much estrogen is bad, it makes your joints achey, makes it harder to gain weight, and absolutely destroys your libido, which is the part that I hated in PCT. If you wan to run an AI after the 4 weeks or in the 4th week and then beyond you can as it can be beneficial when not so much estrogen is being blocked and your natural test levels are a little higher.