Need more info especially photos of leaves from all angles and closeups and several of trunk and main stem (and closeups) ...since this site is unbelievably hard to post jpegs you can post on photo bucket or something similar and post a link or email me personally I can't promise anything but I'd be glad to take a look...David

Sounds like what you are doing is about what needs to be done. There isn't much that can be done at this point except wait. TBH, I don't know if I would increase the watering much if any. If you are watering more than twice a week then you are probably watering too much unless the soil drains and dries very quickly.

I've noticed on several cold damaged trees where some of the new growth after the freeze died on areas where the cambian was damaged under the bark. So if it is sporadic growth throughout the tree rather than the outer most leaves all over the tree that has dried up, I wouldn't increase the watering. This just means that there was too much damage under the bark for sufficient water transfer to those new shoots. It wouldn't mean that there isn't enough water at the roots, just that there is damage somewhere between.