You wouldn't think with a natural, uneven surface like snow that little base burrs could make skis act so nuts, but they can. They make the ski unpredictable because they are not cutting into the surface consistently along the whole edge. You don't want one part of the edge skidding while a different part of the edge engages like Velcro.
The hanging burr continues straight off the side edge very very slightly below the level of the base edge. it is like having a little stationary rudder sticking down into the snow. Skiing won't break it off.
So you can imagine what havoc this creates when you want your skis to slide sideways even slightly. Once you get them up on edge, it's not so bad, but to turn the other direction you must flatten the ski and now the damn skis don't want to come off edge and basically you have 2 little rudders fighting to keep the ski going straight while you are trying to turn. it is truly a miserable experience!
Here is a graphic Slidewright composed, You are looking at the ski on it's side The bottom of the base base is the left gray line & the snow snow would be pinkish color It is too bad he didn't flip it 90 degrees to the left. The top gray line is the side edge.
2 additional possiblities
#1 Skis are under base beveled in the tip & tail or inconsistent base bevel
#2 And this is highly possible. Is there structure that continues from the P-tex into the metal base edge?? this will also act just like a hanging burr. If there is structure in bae edge it must be complelety polished out with a series of diamond stones. Teh issue wit that is you may increase your base bevel over 1 degree depending on the amount of polsishng you have to do to smooth the edge. So they could need a new grind to set them to 0 and remove the strructure in the base edge metal!