The I-CPF is a CL hull. It only carries a couple phasers. It and the CPFW (adds Ph3s) should be classed as LIGHT_CRUISER. Nobody will ever buy this ship at even that pricing bracket, but it is better than NCA.
As for the D6/KR issue, the class changes only affect price and availability on the D2. Such changes would not alter the BPV matchups or effectiveness of the ships. The D6 is worse than a D5, yet it costs more if it is considered a CA. It may have more warp, but it has CL shields and weapons. Until D5s come out, the D6 class is the only CL the Klingons have. More warp + 1.0 move cost pretty much equal a ship with less warp and a .67 move cost. I think the D6-based ships are reasonable to consider CLs.
Concerning shiplist corrections, if I've read FS right in past posts, he has only fixed those ship errors that he has come across or had brought to his attention. It is entirely possible (even probable) that there are errors he has not identified yet. I've been working on a straight reworking of the default shiplist to SFB specs, but it takes me a long time to do because I'm checking every single ship against the SSDs. That's the difference between having a shiplist to play and having one that's still unreleased.