I stumbled on this stupid-simple build that will kick out extra U-235 with splitter priorities instead of using chests and circuit counters.
It takes a bit for it to "settle in" and may kick out some U-238 during startup. Probably not an ideal build for early game as it takes quite a bit of uranium to get belt "back pressure" correct.
Not the exact set-up I use but pretty similar. I like finding other people's build and blueprints and learning how they do it and often times it's always so over the top or just a lot. Why I have it like yours usually. Just simple and easy. Make it into a loop and excess with a splitter.