Actually, it shouldn't be subtracted imo due to the fact we can still see if they're breathing and can know if their body is emitting heat even if they use blush of health since I heard blush of health only makes my vampire appear "Healthy" and less "Pale" in comparison of other Vampires which makes it easier for them to fit in.
which makes it easier for them to fit in.
Exactly, which makes sense for Hunters to find difficulty detecting/catching him and should decrease the successes they get from the roll, even if the sheer reason is to give the merits a script usage.
see if they're breathing and can know if their body is emitting heat
Those are covered by Master of the Masquerade merit.
Seriously, can you guys not make this any more annoying for us, these merits are mostly used by social characters who don't even wanna bother with hunters and other battlecucks, we don't have the 5/5 potence or the incendiary grenades to stand up against you guys, our Presence/Dominate and seduction attempts are countered by just a Conviction point spent. Not to mention, there's 0 ways for us vampires to detect hunters.