We can select what Holds are used for each instrument in the Soloist Editor, as you have the non DI sounding good but the DI is bad, but if I change it then the non DI will sound bad and DI good !
You could put a Selector for the Direct Input Instruments also so it is not changing both, this is great for the dB offset also as you need a different dB for each.

Maybe these Setting would be more accessible from the RealTracks picker window in RealBand rather than being buried in the depths of BB, and they will show in the DI Holds Column also.