Here are my suggestions with progression goals - 5 more lbs or 1 more rep; one step at a time.
I've only trained a handful of super tall lifters and we did nothing different other than try to train smarter and harder. Due to poor leverages, I assume you are already hammering the hell out of the midsection to make it as wide/thick as possible. So keep doing that and keep eating.
Remember to not expect the world if you are willing to give it all.