Where'd you get these figures from?
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All of this said, healing agro is often way over stated on these forums. Pretty much the only place where it will ever really matter is titan, and even then only in early phases with groups that must endure a large number of rock slide -> stomps combos while building limit break. Once past this phase aoe healing tapers off. (Final phase, though more intense, the stomps are a minute apart, so the actual amount of healing done is lower).
Other than from a perspective of MP management, overhealing/not overhealling will have little-no effect on your play "quality." Really, if you are overly concenerend with overhealing, you will likely just risk letting the group fall behind on health and be more vunlerable. That said, this is why whm's tend to have much more hate than scholars.
If you are in any other situation (ie: not pre first jump on titan) and you are pulling threat as a healer, it is your tank's fault. Full stop. No "but in this sisutaion when the winds are blowing ot the west and its astral weather and teh opo-opo king is in moons" situations exist. There simply isn't a reason a healer should be pulling threat because healing has a low modifier relative to damage. Even just constant flash spammign will hold a group against a healer. The only reason tanks are loosing threat to healers is lazy/bad play.
Medica II spam would like a word with you. Many new healers are unaware of how much aggro they generate, and even worse are the ones that think Medica II has a higher number than Medica and must be better and use that as their only group heal. You will not hold aggro against Medica II spam.
Even with experienced healers, in certain fights especially during transition phases, a healer overhealing too much at the wrong time will take aggro. Tanks and healers need to coordinate. Healers cannot blindly heal then claim tanks didn't hold aggro.
Rage of Harlone crit for 580 Dmg. Threat meter explodes...
As said only Overhealing with Medica 2 on 8 targets is the only reason you will lose aggro as a tank. New healer or not if you level your healer properly instead of Fate derping to 50 you'd know that Medica 1 itself is really a threat generator even if no overhealing is done.
Medica should only be used when 70% of it will not go towards overhealing.