I think it looks amazing. You could keep this as-is, and just raise the height limit for the end, so End Cities don't get cut off due to the limit being reached. Also, the pillars being hidden is a bit annoying, by moving those up, it should be fixed as well. Other than that, I think this is a ready-to-go End Update
Can you provide more details? Things like CPU, GPU, RAM, OS and such? Also, any mods you play with? With the information you've given, I don't think the developers will be able to do a lot with it....
It's normal that they're not there. They got removed in the Experimental Snapshots, and because those changes got ported into the normal ones, one can assume that they're not present in there either.