Is it the caps or the preamp of the 460? maybe a certain combo of the mic/capsules/cables/ua5 channel can produce a better match, although I would want to know why it is off.
Has this rig been ok prior or is something new...in other words did you have this problem before with either the ua5 or the mics?
Do some troubleshooting to see where the proble lies....
If you swap entire rig inputs to the ua5 and the problem follows, then the ua5 is ok (do next test). if the problem doesn't follow then ua5 issue.
Next leaving the cable attached to the ua5, swap the mics and see if it follows...yes = cables ok (do next test)...no= bad cable (fix it)
Swap capsules leaving all else the same..did the problem follow to the other channel...yes = cap issue, no= preamp issue
you can call both JW and akg and deceide which path is best for you but...if you are going to mod them then, maybe jw is the way to go regardless.
Hope this helps
peace
jah