If you're a smaller guy, 450 mg's should suffice preworkout for PA. 750 mg's is the studied dose though, preworkout.
As for why the new formulation, most likely cost. ChemiNutra doesn't have the patent for PA anymore so that means anybody that can produce PA can put out the raw for it. So BPI most likely went with the cheaper alternative. What’s more worrying is that we don’t know the standardization for PA. ChemiNutra’s Mediator I think was standardized for a very high percentage of PA so you are guaranteed a certain amount of PA per gram.
Same price I believe. If you want PS though, might as well just get PS on it's own, probably at a higher dose and cheaper ultimately. The PA is really what one would have bought King for in the first place.
I just wish that I bought more OG King. LoL. Have 2 sealed King bottles left and 5 bottles of the other PA product