I haven't used PHD Analyser for some time now, but the latest version is well work a look! In particular being able to review polar mislignment is a boon, and seeing the DEC drift data in this fashion shows me something strange is happening between the hand controller attempting to compensate for slight polar mis alignment and the sawtooth periodic DEC correction pattern!
Very helpful!
http://www.countingoldphotons.com/phdlab