Sorry bit late on posting here. Just doing some reading on Yohimburn and noted ‘ulter’ stating alternating between EC and NYC so the body doesn't get 'used' to any one thing. This is not the first time I have seen ‘ulter’ state this nor is he the only person who has said it. And where is has value in certain products EC is not one of them.
The effect of EC doesn't diminish but can actually increase with chronic use and I am talking years not the few months that you guys would be taking it.
Stick with the tried, tested and proven EC stack and don't worry about your body getting 'used' to it.
My .02c worth
BNM