Might have just found a fix. I’ve had the throttle over a year now, had this issue right from the beginning, tried the above calibration solutions but never got satisfying results (my preferred set up is with no spacers, throttles de-coupled).
I would recommend trying the detent calculator found in user files. Run through all your 3 calibrations and set your afterburner ratio to 75 in simapp. Then run dcs and follow the instructions for the detent calculator. For both throttles I got the same results of 0-10-19-29-39-49-59-70-80-90-100, which only makes the midrange difference worse. You have to even the curve out in the middle, what i did was kept the left curve as is, and changed the right: 0-10-19-29-39-49-60-70-80-90-100. This gave me almost perfectly matching thrust thru the throttles entire throw, only at around 76-80% the left will take very slightly longer to spool up to match the right, but it’s less than a second.
Probably could tweak that even more and get them to match perfectly, I find I spend significantly more time a day trying to fix/tweak everything than actually doing the flying thing .