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80-90 grams works for most people.

If you have higher friction bearings and/or unbalanced spools, you might need up to 100 grams.

With very good bearings, you can get 100% functionality with only 65 grams.

Your existing nuts/bolts should work, but are on the low end of the "known good" range.

I would probably buy the longer bolts and additional nuts as insurance if they are reasonably priced.