So far where I'm at is, I've done 270's off hips (probably the easiest), full 360's on step style up jumps, small 360's onto the top flat section of a jump, 360's on small rollers, 360's off drops (sorta like the first video, but less steep), and 360's going off the side of a jump and into the bank on the side. And I'm pretty consistent with flatground 360's also.
I haven't had much trouble with all the above. I think rotation wise I sorta have an idea of what it takes. It's the whole combining rotation while simultaneously changing your angle from going upwards off the jump, to flattening out, then to nosediving into the landing that trips me out.
I just realized today that you can lean way too into a jump too when trying this. There was a few times where i felt like i was going into a rodeo kind of thing.
Another problem is I also have a tendency to over rotate when i'm landing. This happens a lot when i 360 on the rollers. I can sorta stop myself by digging into an edge but i don't think there's supposed to be that much momentum when i get to that point. There's a lot of 360's i see (especially when they're 360ing into rails where you really need to land straight) where the guy almost stops the spinning momentum just at around 270 and is just eyeballing the landing, and then whips the the legs around in the last second.