PE spikes can be caused by stiction which may be visualized as force ramping upward with a sudden release as the level of force applied overcomes the resistance present. There are two possibilities here, the bottom of the deck plate cap screws are just a smidge too tight or you have a bit too little lift. I would start by adding some additional worm lift using the lift adjustment may fix it but be aware the lift adjustment usually needs to be very small to maintain optimum worm tooth engagement and these are not fine threaded fasteners. So I would make the smallest possible adjustment to the lift adjuster, observe and if needed continue to adjust. It sounds like your worm is close to optimum so with a small adjustment you should be GTG. If you don't see any change the bottom side cap screws are the next place to adjust. I suggest changing the outer or left side first, test, observe and adjust, if after two cycles you see no change try cracking the inner cap screw a smidge.?
You can verify the cap screws are letting the OPW move by wiggling the end of the counter weight and feeling for movement on the outer end of the OPW where the worm bearing block is attached to the OPW. There should be some movement felt on both axis or chances are you need to crack the outer bottom side cap screw a bit. Keep in mind that a little adjustment goes a long way on all of these coarse threaded fasteners.?
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Keep us posted.?
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Chip Louie Chief Daydreamer Imagination Hardware?
? ?Astropheric Weather Forecast - South Pasadena, CA?
Chip Louie