My understanding on Kerma is, maybe was, if you upgrade using purchased parts from them, there was no charge for upgrades. Do you own one of their programmers?
Also contact sales@TDTuning, Mike is a great tuner, and I believe upgrades are not $125.00 each, but you will have to overwrite the Kerma Tune, and will likely be like starting over as far. As tunes go, programmers don't piggy-back on tunes from another programmer. But, there is nothing wrong in calling them back.
You didn't mention if you wanted just the next level tune, or an upgrade with hardware too.