the only problem I can see with your situation is there will be a problem getting rid of 20 some odd grams of material, there just ain't no where to take it from. Even 8 grams difference is quite a bit. (the value given for the remaining 5 rods extrapolated from your statement) I got mine to within +/- 2 grams, which still isn't all that great, but refer to the above statement. So yes I would say your vibration issue is a balance issue, or at least contributing to it. The number isn't as important as the weight. I had a full set of matching number rods, one was messed up and I had one extra that I had taken to the supposed premier shop in the county, (turns out the dad had a very good reputation, while the son who was now running the place was busy ruining the same reputation) to get cut for inserts where they promptly ground the sides away for some inexplicable reason, then declared it "too narrow" and only charged me $50 to ruin my piece. So I ended up sending 4 rods to Egge for machining, and of them one was no good, and of the remaining 3 one was a near exact match in weight.