It sounds like HyperMax would be right up your alley! I am also a stim junkie, but only need 1.5 scoops of HyperMax. Most users report they only need 1 scoop. That is how potent it is.
HyperMax contains Choline which is associated with many functions including (but not limited to) memory, attention, and muscle control. That will help you with your goal of getting "in the zone." I know my focus is laser like.The Rauwolfia will also assist in that laser like focus. HyperMax also contains Amp-Citrate which you are looking for.
In addition, with these ingredients that help with focus and clean energy, HyperMax contains 1g of Glycerol, a standard 500mg of Agmatine, and a full 200mg dose of Norvaline, which all help with getting that pump most people look for.
Not only do you get the focus, clean energy, and intensity, but you also get a nice pump complex. HyperMax is an all in one for stim junkies. Potent on the stims and delivers the pump.