Since OCR is not fixed but subject to change based on IG actions and events, I am not so sure the starting OCR is so important. OCR is representative of both physical traits and behavior (or reputation). Therefore why an OCR is what it is may be different for different PCs.
Similarly, influence and charisma are representative of physical traits and social skills.
Considering we are talking about the interaction of at least 4 traits with loose definitions, there is a good degree of flexibility for how each player may interpret how these character statistics (Race, OCR, CHA, and Influence) interact to create the concept of their PC. It is up to the player to make this interpretation come to life through RP.
I think the system in place does a good job of melding these factors and creating consequences for being an outcast while allowing players to be creative. While I think most of the non-standard races and Calibans should generally be outcasts, I also think there should be a way for exceptions to be made and mechanically this is through influence and Cha. I'm not sure that a little tweaking in any direction would really change the game. These mechanics shouldn't be over emphasized. Much more can be done to create an appropriate atmosphere through RPing these traits and reacting to them than through mechanics.
Suggestions
Slow the OCR reduction rate for Caliban and freak races to reflect their outcast disposition and increased difficulty being forgotten/earning tolerance.
Entering places like the sewers cause OCR to increase in a temporary way to reflect lingering odors.. perhaps for a 8-12 hour period.
DMs give PCs OCR points for talking in public about undead, crypts, magic, sewers, having glowing weapons, eyes, wings, being outside at night, ect.In Barovia.. entering a crypt or even the forest might rouse the suspicion of the locals... who besides the insane enter a crypt, or the forests with all those freakish elves and other worse things. Yeah! And way too few caster PCs are being identified as witches! While Caliban's are freaks, when compared to most of the other PCs, they are really not so odd.
I don't post often so I allow myself to ramble a bit off topic