After reading your whole post, I have a suggestion:

Set the voltages to whatever original values your silent board had from factory. Then, make sure the extruder's bolt is properly adjusted - I had skipping issues with the original board and turned out to be the bolt that needed some tightening. Even if the problem was solved, I still replaced the extruder for an all metal one. https://www.amazon.com/gp/product/B07B5118T7/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1