Just because a rabbit eats more veggies than hay and pellets, does not necesarily mean they'll get bad teeth and molar spurs.
Just like some rabbits eat lots of hay, and still get molar spurs. It seems to matter more what breed of rabbit you have, and what it's genetics are.
Personally, I wouldn't cut back on greens at all. FYI, fresh grass is actually more abrasive to teeth than hay, because it usually contains more sillica.
There are also lots of other greens that are abrasive, like kale.
My own rabbit, Hazel, lives mostly on greens, and has never had teeth problems. Neither has she had stasis, except for a few bouts of gas and slowdown.