Disclaimer: I am pretty sure I just happened to get a set of tools which were not QC'ed very well. I don't think these issues are common with these tools, but I thought my experience may help others, so here it is...
Unfortunately my camera ran out of batteries last night and I was too focused on getting my switches lubed and stickered, so I didn't actually get pictures of the problem. I will describe them as best I can and hopefully this will help others if they have similar issues.
There were two problems with the switch tools that I got (second hand).
1) The last 1/16th of an inch on the legs of were ground too thin and were almost just a burr. This resulted in the burr bending and making a bit of a rounded end to the legs. Because of this, the force was not being applied at the bottom of the tool, but about 1/16th of an inch up the housing which was causing lots of problems with slippage and too much force was needed to open the switch.
2) The bevel or angle on the two legs was not the same on each leg. When force was applied to open a switch it would cause the tool to torque in one direction making it hard to handle. In combination with the first issue, the tool was almost unusable.
Solution:1) I simply filed the legs shorter by about a 1/16th of an inch so there was only solid metal remain.
2) I filed the bevel/angle so the two legs matched on each tool.
The fix was very simple and the results were night and day. It literally doubled the speed to open the switches. I didn't have to be nearly as gentle, I could just stick them in and go and they never once slipped out again.
Here are a couple pictures to show the results of my filing...
