Any chance of sharing the EQ settings?
The B3 Pro is even better than the Pistons in detail, and much more neutral. It is one of the most transparent iems I've ever heard. Imaging is near flawless. Their only "downside" is their bass neutrality. It could use a tiny bit more to my liking, but it is more true to source as is.
I can post the settings for the Technics SH-9010 parametric equalizer + bass and treble controls on the Technics SU-A60 preamplifier, but at the time can not post the resulting curve, as I am not "computer literate" enough to use some software that would generate such a curve, although I do have basic measurement capabilities ( an oscilloscope). It is unfortunately no "easy" curve, graphic EQ with fixed center frequencies and Q will not be enough, parametric equalization really is the necessity.
I am afraid your answer will see down the drain the $ necessary for the Havi B3 Pro. The only downside is the mentioned bass neutrality; I strictly use Meier DIY amp with crossfeed ( it is not the ultimate in "crossfeeding", but does get the job of removing the in the head localization with IEMs well enough - in strictly required portable format ) ; when crossfeeed is engaged (101% of time with me), it does make the bass lighter, necessitating a slightly bass heavy headphone for the correct overall balance. If Havi B3 Pro II does have slightly more bass than the original Pro, that might be better match with Meier implementation of crossfeed; however, NOT at the expense of less flat and extended treble. I can "learn" to work with bass light monitoring, if the treble is a mess, you can not hear what is going on during the recording and may result in rude awakening back at home - or immidiately after the concert, if quiet enough place for the use of open headphones is available .
But both of that is too late ...
I would like to thank you for your input so far and would appreciate any comment on the above.