Balancing beads are for large tires (semi, off-road, &c) and have little or no effect on passenger car sized tires. Even less effect with low aspect (less than about 65-70) tires. Not meant to be used with "sports" tires.
If you are sure the tire was balanced properly, you may have other problems - worn suspension parts, bad tire, &c. First thing I'd so is get the tires inspected and balance re-checked. If vibration persists, I'd look at the suspension.
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