Hi Lynne
Well done you seem to be doing a good job with him.
I agree with Ade, be tough no more pellets!
When I rehomed Arthur my 6 year old male he had been fed pellets and salad all his life and it took him a couple of weeks to get the hang of weeds and eating them with limestone flour! He loves weeds now and will graze quite happily in his enclosure.
Keep us posted on his progress.