What kind of base and side bevels are you putting on those scrapers with the router?
Began doing a 45º angle but quickly found a straight cut 90º right angle is effective and I can use both sides of the scraper to extend the time between another pass through the router. Usually, when it comes time to wax the skis I can't find the old scraper and make a new one.
I still have a metal scraper from the mid-1970s which has a plastic "U" stripping to rotate the thing through the four sides (eight effective edges), only it's not wide enough for contemporary all-mountain skis. I don't recall sharpening it, rotations were more to have a clean edge free of wax to scrap with. I'd use a scrap piece of plastic and or wood to clean the wax from the metal edge.
I actually prefer a metal scraper to plastic. Plastic is flexible and on wider skis, I have scraped the wax too well in sections that it feels like I abraded the base, never encountered that with the metal scraper. one of these days I'll pick up a flat section of steel from HD, file an edge and see how it works.
Nevertheless, new for this season REI is offering members free hot waxing so I don't expect to do much waxing this season other than when I haven't planned ahead, am chasing a storm and or want a specific wax to snow/air temp.