LR Balance not viewable from FIT files recorded by Karoo

Raising a new post on this.  The original question was considered 'answered' but is still an issue for users (https://support.hammerhead.io/hc/en-us/community/posts/1260802566169-Power-balance-not-recording) so I'm not sure it will be looked at again.  The root cause is that Hammerhead doesn't strictly follow the ANT+ spec for this parameter when it writes FIT files, with the result that users can't access L/R balance data when uploading files to Garmin Connect (who wrote the spec) or Golden Cheetah (who are very strict about following specs).  This should be a straightforward fix for the developers, so I'm hoping it can be fixed without much trouble.