You most likely want to be concerned about the imbalance, as it amounts to 4%.
The winding temps of the motor will encrease, efficiency will decrease, and life expectancy of the motor windings will decrease drastically.
Go to This Link
for a good article explaining the adverse effects of unbalanced voltage.
(edited to add link)
[This message has been edited by electure (edited 05-24-2006).]