Thanks, Rhyseh, Veneretio. I'll play with the spec a little to get the survivability back.
Good point, Griff--I have the mats for the shield enchant--I was a little dumbstruck after making other changes and finding my def. rtg. at 549 so I left it alone while trying to come up with a plan. hehe. I think I'll do that and also change my def-to-chest enchant for health. That way, I can regem the chest as you have suggested and still have ample def.rtg..
Better, still, I'll keep my eyes open for that shield--didn't realize it was BOE so thanks for the tip!