That’s some good info, thank you for that. Mounting on the rear of a 370 is incredibly difficult to get it to be perfectly level. Every few days they move slightly down , need to secure them a little better. There’s words going around of a 3D printed rear mount for the Z. Need to find a way to secure it better.Something to consider when it comes to angling heads up.
Be careful on how much you angle heads. The beam spread is about 2 in per foot average on a regular RX head, the TX might be different, I have never tested one of those, and I know it has a vertical beam but I don't think it fires with the dragon. Two inches per foot equals about 8 feet at 100 feet
So if you use those numbers you have about a 9 degree total beam spread, if you divide that in half you have approximately 4.5 degrees of beam spread up and 4.5 down, if level. This limits how much you can tilt the head and still have coverage in both directions.
So if you can actually get it precise then 2-3 degrees would be about as much as you would want to go and still have some coverage for ground level shots.
IMO all heads could be angled up 1 degree or so, but getting that precise is really hard to do and maintain in the real world. I think the difficulty in achieving such small amounts is why tweaking heads seems to have such a large effect on performance.