Bow looks good, the right tip looks a little stiff and from the lines behind it, it looks like its not bending quite as far.
Backings should be put on prior to tillering from what I understand, so your looking at retillering the bow if you add boo to the back.
If you decide to the temper the belly, you might want to put some reflex into it to while you add the heat and this might fight some of the set that is occurring. While the stave is in the reflex position is when I'd add the backing. Gotta be careful that the boo doesn't overpower the belly so go slow when retillering.