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Hi Steven and welcome.
Sounds to me like the worms definitely need some adjustment. I have a G11 which has a similar setup.
As a general rule the worm should be positioned until you can just feel a tiny amount of movement between the worm and the gear. The next thing to check after setting the worm is that it allows the gear to drive completely around without any binding. With this adjustments made you should notice quite a difference in operation. Just try to keep everything square. Some use feeler guages to set the worm blocks square to the frame and gear.
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