Currently Healing will handle both diseases and injuries (though disease-curing is limited by your IQ's ability to handle penalties). If you want to concentrate on healing battle damage, you could take the -20% "Injuries Only" limitation, possibly along with "Reduced Fatigue Cost" for +20% per level to make individual heals cheaper.
Under your powers concept, should Leonard's invisibility be able to last all day? An easy and obvious way to reduce its cost is to pile on a bit of Costs Fatigue, particularly since Krys has reset the cost to -10% per level (rather than the canonical -5%).
And now a few pesky character-background questions, intended as probes rather than attacks. How does "psycho-kinetic/healing" justify Invisibility? And, per your Shapeshifting question, how would opponents "block psychokinetic and/or psychic healing"? (I suspect Krys would really like to know.... )