After playing with this strum for a couple hours I noticed a few things. My nails(which are filed appropriately) grab the string less than when up strumming straight perpendicular to the strings. I had to adjust my chuck technique and my thumb sometimes misses the A string. Think I need more wrist motion with the finger movement like you show in the vid(I didn't catch that the first viewing.) I noticed much less volume in my triple strum with my thumb so I am thinking of getting a thumb pick. again, thanks for the great lesson.
edit:
adding the wrist flick fixed both problems I was having.