There is plenty of room on the androgen receptor for both test and primo. What I find works best is stacking moderate doses of 2-3 compounds vs just running more of one compound. The synergy of multiple compounds creates a 1=1=3 effect and I find less of each compound equals less side effects. Plus in the case of primo, cost is a factor. Its a great compound and I’ve heard guys using doses like you mention, 800mg, but in my personal experience, I do well with it using more test (in your case maybe 500mg) along with moderate primo (in your case maybe 400-500mg). Ive always used Geneza Prima 100 and it’s been strong. Plus I trust it. The females I work with use this brand when they want to run primo