My thoughts are I dont know about the nerf thing but I am a believer as of date of the lower lvl heaing touch spells because I am still in the 5 second window if I dont let the spell go off. So i cast it watch the tanks health and move last second to keep me out of the 5 second rule if he doesent need the heal and still have a very mana efficent spell ready to go off at all times. I would like to see where you read about the nerfing of the spells so that I can rethink how I want to heal based on the new rules. But if they are similar to how they currently are I will be a believer of maxing out my +heal ratio to the end :) 

Rath it has been good to see your healing numbers climb you have been doing a good job, if i were you I would continue to watch my overhealing numbers compared to total healing and try to make it the best ratio possible while keeping people alive.

I also want to say rath if mana has not been a problem then just keep doing what you are doing just like your last statment said dont mess with it unless its an issue