redecoffee wrote:Did you ever find noticeable imbalance when using only one?
Nah, I used to think this would be a thing before had panniers, it isn't. I've had the odd stupidly imbalanced load before (i.e. more than the rated 25kg rack limit on one side) and you do start to notice then that you're naturally leaning the bike the other way a little but it doesn't cause handling problems.
Main problems with heavy loads on the rear only (lopsided or not) are inadvertent wheelies on steeper hills/too much power and careless dismounted handling.