Richard,
I had a GRS 20x8 (Mejzlik copy) on my 2.4 pulling a 16.5-17lb 80" Texas Hurricane with aurthority. Would Hover with that propeller and slowly pull out. On a warbird you should have plenty of speed and still be able to slow down. In fact a 20x8 should pull you out of the grass better than a 20x10. Your Zeke fly's nice per your video you have everything pretty much dialed in.
Wonder how a 3W-42I would do on the WM GS Zero.

JDS