I really like the layout.
I understand your concern with the right side lookuing "massive" - is it mostly Anubias?
Perhaps would look better as your stem plants bush out more, in particualr your polysperma on the right, keep them well-pruned to encourage lateral growth.
You'd be right to move the Lily over to the right a little I feel.
The wood looks a little small in the centre.
Lovely tank though, better than most we see here IMHO. Have you considered posting this in Planted?