Sounds like some backlash, Kenn. The lag is probably until the worm rotation takes up the slack. How much wiggle do you have at the end of the counterweight bar? It should not be more than 3-4 mm at most. You may need to set your worm into the ring gear a bit more.
John
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Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, Sequence Generator Pro and PixInsight user
