Trueplay resolves distance as a part of the tuning process, as I understand it. So further adjustment should not be necessary. But it would be good to allow users to override the “default” Trueplay settings. For example, for those with partial hearing loss in one ear and need a higher volume from one side. That applies for all speaker/room setups. 

Quick trueplay does not accurately set correct distance for the surrounds. My left surround is noticeably louder than it should be because it's set at more than 10ft which is false. Quick trueplay tuning is different from advanced trueplay so the surround distance is not correct.

Might be best, then, to submit a system diagnostic within 10 minutes of experiencing this problem, both ways, with TruePlay and without,  and call Sonos Support to discuss it. Don’t post the resulting diagnostic numbers here, they get sensitive about GDPR.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.