blast and cruise is essentially HRT with occasional cycles, and yes, I believe you should do a PCT for several reasons.
Even on HRT the body produces test. Of course, if you're cruising on 500mgs you be completely suppressed. And yeah, I think full balls are nice to have.
And it's good for the body to produce some test on its own. I find the cycles yield better results. I do not understand this mentality that it doesn;t matter if you're on HRT.
I'm not an advocate of the dbol in the morning theory, though I think 5 mgs of d bol 1/2 hour before an intense workout works well.