As usual, here I am at the end of a bunny conversation.....

The other thing to remember is that no bunny will eat their entire allotment of hay (this used to drive me crazy)... I'm sure you've noticed that they will selectively pick and choose which strand of hay they will eat, it has to be JUST right!
And yeah, they won't eat their soiled hay so I've learned just to toss and add fresh hay twice a day. Tazz, It sounds like you've given up on the sifting litter tray....?