We recommend to start with 1 scoop of WF, to assess your tolerance to it's ingredients. I advise you do the same with Reset AD, then you can judge from there. I see no problem with stacking both of those products as long as you start off small like I said. Xtend is aminos so I wouldn't worry about that.
On a side note, I've used alot of preworkout products with caffeine and got jitters pretty easily. White FLOOD *NEVER* gave me jitters. It's more of a focused energy, rather than a chaotic jittery energy. Good luck bro, you know you can hit me up anytime.
RR