What's the rationale behind keeping it as low as possible without going too low. Some seem to suggest "limited beats over a lifetime" which sounds a little far fetched, but I can't say that's untrue.
Please, fill in me in on the benefits of "optimal RHR", and what do you consider that to be?
For me personally, the reason I keep on top of lowering HR on gear is not so much the HR number in absolute terms, but the reason it gets there and what it is relative to when i'm off gear. In addition to that, i also feel the beats are stronger and it can be uncomfortable - especially lay down - and I can end up jittery.
I'm usually around 65bpm off gear. On it, I go straight to 85+ because all the gear increases beta adrenergic load, sensitising to your own catecholamines as well. Test, Tren and Nand being the major contributors - possibly MENT too based on what some others have reported. Mast will do it too, though I haven't used Primo enough to see for sure. For me, pretty much all AAS raise HR to some degree and it's a case of how much.
Early on in a cycle, Nebivolol at 5mg will mitigate that increase back down to 65-70bpm even if the stimulus is moderate Test/Tren (e.g 600mg Test/200mg Tren). Around week 16, 5mg starts to lose its ability to modulate it and it'll creep up and feel uncomfortable, and when I include HGH as well, I end up circling 95bpm at rest regardless of the 5mg Nebivolol or whether it's early or late in the cycle. It'll start from day 1 with HGH.
I'm particularly sensitive to the beta adrenergic side of gear as this shows, which is made worse if the AAS/PED increases conversion of T4 to T3 like Tren/HGH do, so I use beta blockers and Iva to control it.
If I was around 80bpm+ or so just naturally, or if the HR increase on gear didn't feel physically different like I'm stimmed up, I wouldn't be so concerned about lowering it. The huge leap from 65bpm to 85-95+ directly from gear depending on whether HGH is involved shows me I'm probably better off doing something to mitigate some of that load. I don't typically mind where it sits at during the cycling as long as it avgs 75bpm. I personally don't try to push into the 60s or as low as I can. Just mid 70s.