My concern is that safety data on stimulants goes out of the window once someone is combining them (in most cases).
For example USP Labs funded safety data on Jack3d (caffeine, DMAA and huperzine) but adding additional stimulants is different territory in the same way that increasing the dosage is new territory. I would be against combining multiple products as a general rule for this reason.
I am only looking out for your health. Admittedly it might be futile given the sheer amount you are taking. I don't feel comfortable letting someone use 7 scoops of Enhanced. If you can use that it isn't going to be the pre workout for you. It would far exceed the available data on nitrate intake as well.