I am really sorry to say that, but I would not call William a high end brand.
I heard similar problems from other owners of the EDT and of the ED/SD series. The only 3 really good telescope Williams ever sold are the 80/480 super-apo, the 80/600 super-apo and the FLT 110/715 FluoroStar. All 3 optics are not made by Williams. Both 80's are TMB and the FLT is a TEC. I am not surprised by your experience.
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