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I can only echo the others here but check out the mechanicals first.
PEC is useful way down the road when you start imaging (and in the current generation of firmware, it's a bit broken for us in the southern hemi - it plays it back inverted - you can get around it but it's painful).
Plus, the whole procedure requires a great deal of patience if you don't have some kind of guider to do the training with anyway - 20 minutes of sitting there tracking with the handpad is something I couldn't be stuffed doing!
I would check one thing first - given the scope is second hand, see if PEC is turned ON. It might be a bad training data. Ensure it is off.
Given you're AltAz, you're always going to struggle a bit because the scope is tracking on both axes.
A wobbling every 2-4 seconds (I assume in RA?) is very unlikely to be PEC. It sounds like a mechanical issue - some minor adjustments will probably fix it up.
Turbo
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