Lower the cart down onto a stationary record. Look real close at the space between the cart and the record. It should be just about perfectly parallel. If not, you're just gonna have to adjust VTA until it is. This is a good thing. The harder you have to work at stuff like this the more it drives home the importance of thoroughly researching before buying. Easy on the fly VTA adjustment is essential. Especially if you have more than one cartridge. You will never make this mistake again.
Now its perfectly parallel. Put on a record that has this problem. Stationary. Rotate slowly by hand watching this same clearance under the cart. Keep in mind that rotating slow like this is different than playing. Rotating slow the cantilever has time to lift the whole cart up when a warp comes along. When playing it comes faster and can compress the cantilever enough to make contact with the cart body, and that would of course cause mistracking. Even not touching, the body is very flat, air pressure could be enough to briefly reduce VTF enough to mis track.
The best solution is a record clamp and washer like you will see on the Miller Carbon. Look close at the pictures. The black washer holds the center of the record up just slightly above the level of the platter. The clamp is dished out and pushes the record down onto the platter so the outside edge contacts first. The record is forced to lay flat. Even warped records lay perfectly flat.
You can build one like I did or buy, just be sure to use it with a washer, which is really easy to make- or even use an ordinary metal washer, which is what I did for a while before going to carbon fiber.