Great shots. I have found that if you add a 1/4-20 screw with nut in the V of the Arca Swiss adapter it helps with possible twisting of the adapter.(the 1/4-20 nut sits well in the V and you have 2 points of purchase)
The RGV really needs a channel like yours, Looking forward to future videos. I love going to the Valley for birding. I have been kicking around the idea of going down there real soon.
I got curious about the adapter plate you attached to the vh, since I have more or less the same camera setup as you. Does it have a brand name, where did you find/ order it? Thx for an informative video!