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If it ain't broke don't fix it. Seems like you're inventing an itch to scratch. The hobbyist in you is showing through. Seems like your room is near perfect.
If you only have single layer of wallboard between living space and garage I don't think that have to make the sheetrock thinner. All the bass below 100Hz is already passing though easily. Insulation in that wall will help acoustically if there isn't any. Code has special requirements for walls between garage and living space, for fire and fumes you might want to check out.
https://www.acousticfields.com/how-to-build-a-diaphragmatic-absorber/#:~:text=A%20diaphragmatic%20absorber%20is%20a%20sealed%20box%20that,in%20speed%20and%20then%20enters%20the%20cabinet%20inside.
If you only have single layer of wallboard between living space and garage I don't think that have to make the sheetrock thinner. All the bass below 100Hz is already passing though easily. Insulation in that wall will help acoustically if there isn't any.