I think you're fine...cuz I just looked at their most recent pics and they are plump little cherubs!!!

Seriously, the bunny folks I know feed fresh veggies 2 times a day and we do that at the sanctuary as well where the buns have unlimited hay, grass and dandelions. The hay, as you know, is the most important so I would say don't worry about how you are feeding them , you are obviously doing something right. I'm stumped as to why they are that "statuesque!"...they aren't getting Cherrios or bread are they?