Hard telling, best to get bloods before and then 3 months after you start the primo and see where you're at and then adjust accordingly. I've been on TRT for 5 years now, I'm 54. I've tried different "add ons" to my TRT to obtain a bit more leanness and more performance enhancement. I think my fav was anavar (from the pharmacy), had only a small affect on my lipids and they bounce back rather quickly. Dr wants me to try a low dose deca for my joints but not sure on that yet.
Jan of this year I had bloods pulled and my T was a little over 1100 and E was 27. That at my TRT dose of 210mg a week of T with no "add ons" or ai. I started adding on 200mg of primo of a bit more fat burning and enhancement purposes. After a few months my joints became very achy and were popping all the time, in addition I generally wasn't feeling well. I had blood pulled last week and found my E was now 2. Lipids were lowered a little but nothing drastic. My rbc and HCT were high. DR asked me what I did and I told him, he suggested I try deca.
I guess the only way to determine what test/primo ratio is optimal for you is determined through bloods. I guess for me a 1/1 ratio won't cut it perhaps 2/1? I might play around with it again come summer, we will see.