I think test and DHB indeed would be the most potent option and could yield the best results as far as gains. At first, DHB was my preferred option in a way, but after reading the posts, I think the test + primo could work well and, while mild, it can still yield a nice cosmetic effect.
You can even go to another route that a friend of mine is doing under my guidance and it's: Test + Masteron.
Consider that Masteron is veeeery similar to Primo, but a tad less potent on building muscle.
There are no secrets.
He started from 250 TestE 400 MastE after 4w did bloods for E2.
If E2 levels were between 40-60pg/ml he just adds 200mg more MastE
If E2 are under 40pg/ml he just adds 125mg more TestE and then after 4w redoes bloods for E2.
Masteron for some reduces E2 by a lot since it improves how your liver gets rid of estrogen (sort of), for others not at all, basically you check for this effect.
(I can use 2g Mast without having a single reduction on E2 levels)
This way you build your cycle into your total dose (mg) that you want to use.
Let's say you want to use 1g after some time you can end up on 250 TestE 800 MastE or something around that, with E2 in the range that you prefer and enough mg to be anabolic.
Having E2 in a certain range will lead you also to a certain level of HDL, that can be improved by Cardio, diet and some supplements.
In the end you do a fairly cheap and healthy cycle.
Nothing that will lead to the same results as harsher cycles but still, it has it's purpose...