Subjectively, i think there may be something to what you're saying. I feel that some of the "full spectrum" yields from ACRB, that contain NMT etc, could be the culprit.
I prefer the yellow or even goowax to mix into enhanced leaf (mullein) for that reason.
Sine experientia nihil sufficienter sciri potest -Roger Bacon
*γνῶθι σεαυτόν*