Sorry, misunderstood your intent.
A half dozen or so reactions (currently 5 "grades", -2 to +2, with 2 duplicates) seems to me to be sufficient for some fineness in grading reactions without becoming confusing. YMMV
System seems to be working fine. However, I would suggest removing the negative 'scores', even for dislike (thumbs down) and angry reactions, and giving them a positive value as well.
If the rationale for the "Reaction" score is to see who is provoking the most thought and conversation with their posts, I would argue that thumbs down is also a reaction. Valid enough to be included by the admin, so probably valid enough to be counted in the scores, for those to whom such things matter.
Removing "negative" reaction scores and adding to a person's score even for negative reactions would also eliminate any kind of gamesmanship by posters, or even outright harassment (just thumbing down people you don't like regardless of what they say in order to reduce their reaction score - we did see this in one of the older iterations of the forum). I haven't seen any of that here in the current iteration, but it would eliminate the possibility.
How it would work, is if you saw something that displeased you, you would voice your displeasure knowing that the fellow's reaction score would go
up. I think this would be more in line with the intended use of the system - to use the reactions to genuinely voice approval, disapproval, anger, amusement etc. with someone's post, while removing the capacity to use them vengefully.
Anyway, just a thought.