Read my posts above - suggesting C2 as the culprit for output discrepancies is incorrect and would be a band-aid solution. The gain of all of my preamp/transformer assemblies is the same +/- .3dBAdjust C2 to set the sensitivity you want. You can replace it with any value you prefer.
Circuit and transformer decide what makes it from the capsule to your preamp, not the other way round.
Not the same capsules. These don't need taming, but... chopping up metal for science is always a good thing
If anyone ends up with an oddball zingy capsule, get in touch and we can work out a replacement.
The issue is the capsule and the varying capacitances of the capsule, i.e. poor quality control.
I'm not certain they are different capsules - take a look at the photos I took of the capsule and those linked here of the MXL 991/603. I'm not seeing any differences. Maybe better tolerances on the Maiku ones, or perhaps different diaphragm thickness. Based off the photos, the Maiku capsule is more of a MXL clone than a Neumann clone
As far as zingyness goes. Well, I have 7 capsules that are very zingy in comparison to my KM86. Care to help?