Yea, Holy Shield heals for the MAX hitpoints, not current. So if you have 1000 max hitpoints, and your at like 500 hitpoints, you will be healed for 5% of the 1000, which is 50 hitpoints.
mega flare is really nice, cuz it really explodes at the point u click on, and not like shockwave. maybe u could do a flame strike at the end instead of an explosion
holy shield looks cool, but.. does it heal 5% of the units full life or just the amount of life it has on that moment?