Hello Simon,
Chis Venter left out a very important part of reinstalling the worm. The 1/4-20 bolts that seat the worm into the ring gear. Not his fault as SB added the step after he made the video. If you didn't do the adjustment all bets are off and that easily could be the source of your problem.
What you describe as swings sounds to me like uncorrected PE. Are you seeing these 3 arc-sec swings with PEC on? If PEC is off 3 arc-sec Peak to peak is not at all a problem and you will get rid of it with PEC. If you have trouble with TSX getting PEC going I highly recommend PEMpro. It got my MX down to around .6 arc-sec.
Peter
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