Hmm, that last pic looks better – with the axel where I’d expect it, just behind the sticky out lump behind your big toe (the tibial sesamoid apparently) but I would expect that to be closer to the middle of the range of cleat movement not at the very end – could be the angle/perspective of the camera maybe. Amount of toe overlap looks reasonable aswell in the last pic.
You really need to be riding on the drops on rough downhills tho, your hands are bound to get bounced off the hoods, if it’s really too low raise the bars a bit. Learn to get your arse behind the saddle on steep stuff aswell. CX appears* to be a different technique, you can’t mince down slowly with the rear tyre scraping your shorts, bit more speed and momentum with your weight further forward. I’m a confirmed saddle dropper on the MTB so getting used to steep downs on my cx was hard work and I still get nervous but it gets better quite quickly. I can get behind the saddle ok but getting back over the top when the trail bottoms out occasionally gets me, usually with humorous consequences 😳
*just a guess, not had any training or even read any CX technique** mag articles
**officially it’s probably “get off and run”
😉