RE: Optimised build. When I find the time, unfortunately. Super bogged down with a website build/transfer to do any modding of any kind at the moment. Sorry.
RE: Grass. If I find the time I'll compile a build with the grass fix directly inside. It's so friggen stupid, because the grass fix was working just fine for me. That first gif in the op is my mod + grass fix. Then, one day, I turned on my mod and it was no longer working. It's like the game just decided "Nope, I don't like the grass fix any more". Compiling them together might work as a fix. If it doesn't, I'm out of ideas.