First off any alac above 10% is uselesss trust me i tried to stack it in augments.
Power and surge are the way to go.
get some augmented gear i run with only 2 pieces of rakata and 1 campaign chest now. I moved mods from my black hole chest to my legs. my leg armor of black hole to the legs but the other mods to my saber.
WP augments over alacrity( i bought all alacrity at first.)
after 10% its like 2% per .1 seconds.... you want you heals to Hit Harder, you are going to rely a lot on inverate ,revication and that hot what ever its called.
ALWAYS hot the tank(gives armor bonus) try to stand in your own revication so when you consume you give yourself a chance to heal. also cleanse yourself its a free 500-800 hp