Richard J Kinch wrote:

w_tom writes:

Also balancing the counterweight springs so that the door
does not 'skew' will help.

A skewed door is not caused by any imbalance, nor corrected by "balancing".
....

Well, if it has tension springs on each side and they're not matched or
tensioned, evenly, "balancing" them so they match force will certainly
go a long way....