First of all, that is not a proper burn in technique for transports. You can't just leave the player playing random music because there could be serious consequences.
Let's just hope your player isn't ruined.
You need to prepare music material in advance and you have to do it in order. Before you even start playing some music, you need to play 10 minutes of pink noise so that you try to negate the damage of random music playing.
You said that the sound is clinical? Then you need to start with mid bass, so play some 50s Jazz and use only Impulse and Bluenote releases. Think Miles, Coltrane... 60hours
After that you need only 30 to 40 hours of 2000s minimal techno for sub bass.
Now the hard part is to open up those kicks and to solidify the bass and for that you need some 80 hours of drum n bass.
All this is good for the bass, but it will close up some mids, and to reopen them, you must play 40 hours of male crooners from 40s to 60s like Sinatra, Dean Martin, Early Bennet... But please, no Michael Buble or you will mess up the imaging.
Now finally for silky smooth upper mids and highs you can play modern jazz female vocals like Nicki Parrott, Emilie-Claire Barlow and similar. 40 hours will do it.
The important note is that you can't just let the player play without you listening or you will develop something which is called the Cold Burn and that will mean that your player would be unburninable anymore.
Also, you should own original CDs of the material, but play only the burned copies because it will burn in the player without wearing out the motor. And please, use only 8x burn speed for CDs, not the 16X or you will cause overburn.
Good luck!