the Improved LH multiplies the effect by *10, so it become 70k from 7k, and then it critical to 152.
Personally I don't see an issue with hat, as I said before - you can't heal for more hp than a person has, and its as Complete Heal as it gets

As far as Fervent Blessing 3/3 going, again my guess is:
-since use time now 15 min, it subtracted 36 from 15, ended up with -21 minutes, and rolled over the variable, and ended up being somewhere in 500 hours

My best advise at this stage , to get new LH work properly, we need to get you to un-learned this AA, and then Tyler needs to disabled it server side - seeing it to like level 200, so people can't access it anymore.