You might try speeding the engine up and watch the belts too see if they start to whip at higher rpms. If the belts run steady it is more than likely an alignment issue. If the belts whip it is more of a balance issue. Usually the crank dampener or one of the driven accessories causing the whip. Combining a harmonic frequency with the load the belts will break. We had an engine we kept installing new belts because we thought we had a alignment issue, spend a ton of time on alignment. It turned out the dampener was going bad. It does not take out of balance much to make belts whip.
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