I had this exact problem with my 20/21 WC 118's last week here in the Canadian Rockies. I had just brought them in for their first tune after 10+ days of hard skiing to a reputable ski shop and on my first run out I thought the skis were possessed - the were super sketchy and all over the place. The ski hill has a tech shop that let me borrow a diamond file that I used to detune the tips and tails but that didn't fix the problem. Thankfully I had my Ranger 102's in the truck and swapped those in for the rest of the day.
I took the WC118's back to the ski shop the next day and they gave them a grind and re-set the base/side bevel. They tech at the shop suspected that the tune was fucked up somehow and I can say that since they did the re-tune the WC 118's are skiing like they did fresh out of the box - big sigh of relief!
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