The cycle layout looks good, but you will also need to add in there some cabergoline for prolactin control - 0.25 mgs E2D or E3D would be a good starting dosage. Make sure to be using both Aromasin and Cabergoline from the first day of the cycle.
As for the PCT, I would strongly recommend the perfect PCT protocol, as described here -
http://www.evolutionary.org/the-perfect-post-cycle-therapy-pct/ It may seem like a very complete PCT, and you really need to run a proper PCT in order to keep your gains. Besides, for a smoother PCT you will also need to run a very comprehensive PCT. Remember, the cycle itself will be pointless if you don't run a complete PCT to reinforce those results.
Regarding the HCG, I would not use HCG, neither on cycle, nor off cycle, since its benefits are definitely not worth all the risks. It can cause such side effects as gyno and suppression, and it will barely do anything for your natural testosterone production. In fact, it only mimics the functions of LH and FSH, but it will not actually make them work. As a result, you will get an increased level of testosterone only while you take HCG, which will drop back down as soon as you stop using it. Therefore, it would make sense to use something that will cause less side effects and actually do something for your natural testosterone production. For instance, you can use HCGenerate ES - it will keep the plums big and functioning during the cycle, and it will be a great help for natural testosterone production during PCT, since it will make LH and FSH actually work. As a result, your body will keep producing testosterone even after you stop taking it. However, unlike HCG, it will not cause any side effects at all, and it is more convenient, since it is taken orally. Besides, the libido boost from HCGenerate ES is a sight to see.