I experienced this a long time ago, and I have skied with Bob so I'm speaking from some experience.
They have been "over tuned".
De-Tune them with a gummy stone. If that doesn't work, then take them back to the shop that tuned them, and tell them your issues, have them base ground to flat and have them tuned to a 1/2.
It has nothing to do with the angle of the side edge.
What is "overtuned" anyway?
If they don't take the hanging burr off after tuning the side edge again the OP is just going to have a lesser performing edge angle with the same erratic performance.
Our skis are razor sharp, tip to tail. All of skis are no matter width are tuned .7/3 except our Slaloms with are .7 /4. They all ski like a dream, smooth & predictable. Even my brand new Enforcer 100 came from the factory with a 1/3.....THEY SKIED ABSOLUTELY PERFECTLY RIGHT OUT OF THE WRAPPER. EXCEPT FOR ME WAXING THEM!
It's not the geometry, it's a simple issue. forget gummi stone, you are just going to dull your edges. I only use a gummi as the last step in the tuning process at a 45 degree angle to the edge point with ABSOLUTEY -0- ZERO pressure, to remove any slight burr on the edge point from the tuning process.
By the way since I always have a surgical stone in my pocket, I have fixed numerous peoples ski right on the hill with the same issue. Someone saying, I just had my skis tuned and now they skis totally erratic......They are shocked when I am done (yes right on the slope) they ski perfect!