The 64.5-65 head angle seems to be at odds with just about everything else in your wishlist. Especially the "rougher trails and bike parks" part. The last "enduro" bike that I had with a HTA >64 was a 2013 Nomad. The last full suspension bike I had of any classification with a >64 HTA was a 120mm Smuggler.
If you look at what some of what the top EWS (sorry, EDR) guys are doing, I think it lines up with what you're looking for. They're sizing down in reach and throwing a longer fork and/or angleset on to slack out and raise up the front end / BB. That lets them smash through rough stuff, but then still easily weight the front end to cut in on silly Euro switchbacks. Slightly higher BB helps the bike tip into corners when leaned over aggressively.
I think for the rear end length you're looking at, 63.5-64 front will handle just fine as long as you stay on the shorter end of your reach. And maybe a 50mm stem instead of 40mm for more twitchy.
If you look at what some of what the top EWS (sorry, EDR) guys are doing, I think it lines up with what you're looking for. They're sizing down in reach and throwing a longer fork and/or angleset on to slack out and raise up the front end / BB. That lets them smash through rough stuff, but then still easily weight the front end to cut in on silly Euro switchbacks. Slightly higher BB helps the bike tip into corners when leaned over aggressively.
I think for the rear end length you're looking at, 63.5-64 front will handle just fine as long as you stay on the shorter end of your reach. And maybe a 50mm stem instead of 40mm for more twitchy.