Tons of problems with my test set up, but I understand them, disregard upper and lower ends.....looks like about 2.5 k dip, not bad, but still, boosting 2-3 k, at a "q" about the size of the hole, sounds better than trying to cut the whole top end off, and makes the hole worse, took awhile to understand this, using the mic amp eq, or mixing board, these dips suck until you know about where they are then you can work around it.
Still working on high end eq of this mic , De-emphasis using a 500pf makes the valley almost vanish, but mic sounds honky, moving to 518pf, the valley returns but mic sounds better and moves peaks within 10db, sure looks more c-12 than u87 that way though.