Yo, just chiming in to say that Laser Bullets go through Aragami; Ren being able to heal you very often doesn't really come off as a surprise with that in mind, since while they're slow, they don't get stopped like the regular recovery bullets do.
Plus more hp can be healed using laser recovery bullet... Oh hi Baluar. I see now that you've got a profession switch (Cheaty Gamer --> Expert Sarcastic Guy). Attack +0, Defense +0, Speed +0, Sarcastic Magic +35. Congrats (=ﾟωﾟ)ﾉ………
Hmm, when you bring that to mind...yeah, it is a little fishy.
If I had an assumption that made the most sense, it's that it has to do with the 'infection' when the MC dual wields their own and Lindow's God Arcs. A sort of oracle cell agitation, so to speak, that makes them heal their wounds quicker.
If it isn't that, then we can chalk this one up to game logic. It's a bizarre thing.