Halotestin is usually a strength/hardening steroid used by powerlifters or bodybuilders the last 2 weeks of their contest prep to harden up before their competition.
It is the most liver toxic oral steroid in existence. You DO NOT want to use it for a long period of time. 2-4 weeks max for halo.
I would scrap the halo all together and run a mild lean bulking cycle.
I really like EQ. That would be my recommendation. EQ will give you a really nice increase in strength and vascularity with very minimal water retention. EQ is also really good for increasing endurance. Test + eq is a perfect lean mass cycle. The nice thing about EQ is that it isn't liver toxic like oral steroids are.
You can read up on EQ more here ->
https://www.evolutionary.org/equipoise-boldenone-undecylenate
Here's what I recommend:
Weeks 1 - 12
testosterone e 500mg/week
EQ 300-600mg/week
aromasin 12.5mg every other day
After your cycle run the perfect PCT protocol:
http://www.evolutionary.org/the-perfect-post-cycle-therapy-pct/