If this was a classical orchestra then I would expect some things to be on one side and other things on the other. That’s just natural. If you’re doing a mix of a rock band you can have keyboards on the left and electric guitar on the right for example.
The single most important question is how it sounds. If it sounds good then the difference in energy left versus right isn’t really a problem.
- How does it sound?
Also, the lower the frequency the less directional it is, meaning that it’s much harder to pinpoint where a low frequency is coming from compared to a high frequency. So there’s often a point where your ears and brain sort of lose track of left/right. The sound is just sort of there. So again it depends.