The saddles will not likely change much, though as suggested, the contrast can be enhanced with substrate colour.
There were a few threads on this quite a while back, but the consensus among the poly experts was that a red or red / brown substrate produced the most distinct contrast.
BTW I have 2 del's; one marked similarly to yours, and one with 7 distinct black saddles. Both are unique in their own way and are awesome fish.
You have a great specimen there, keep us posted as it grows!
O