Wudog... I have the solution. Everyone suggested dropping the serving down to half a scoop, but you mentioned you were concerned that the other 'goods' in the product would also be cut in half, which is true. Grab their 'post-workout' formula Synthesize by VPX. It actually the same thing without the 'redline energy' stuff that you're affected by. Put a half scoop of that in your pre-workout drink too with the half scoop of NO-Shotgun and you're golden. Obviously it's going to cost you extra to buy another jug of Synthesize but it'll last you for 56 total servings instead of 28 because you'll be using half of each scoop from each product.
Just an alert, because I don't believe enough people say this (most people on here are quick to warn you of prohormone dangers, and rightfully so) but if you experience any heart or breathing related troubles at any time (working out, driving, at work, etc...), make someone aware and try to take a breather. Some people don't know they have conditions until something exacerbates it and it could be too late.