Hi Chris,
Your are on the right track with your work block aligning, that and the distance the worm sits out. Common problem of people having the worm block too tight.
One solution to your block alignmernt is the newer one piece design available. But you should be able to get the 2 piece ones working well again. One practice Frogginator taught me was to use the with cover as an alignment square between the 2 blocks, then use a feeler guage set to around 0.5mm and gap the far end block from the mount and tighten.
Trev
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