After listening to the Cardinal for another 1.5 hours, I would like to add a point of difference between the Cardinal and BL-03 in the area of technicalities: Instrument separation/details/clarity/imaging is slightly superior on the Cardinal. If I can give a ballpark figure, subjectively the Cardinal has about 10 - 20% more details and instrument separation. This is because of 3 reasons - soundstage is slightly wider on the Cardinal, isolation is better on the Cardinal and lastly, the elevated midbass in the BL-03 relative to the Cardinal also obscures some details in the mids. It's still a marginal upgrade at best, and the overall tuning is still similar to the BL-03, maybe except in the bass frequencies there are subtle differences. Cardinal is indeed shorter by a few mm, I think if u have problems with the fit of the T800, you will probably still encounter issues with the Cardinal.