Hi Judeth, I think 400°F is hot enough, but it's possible your oven is running a bit cool. It might be worth investing in an inexpensive oven thermometer to double-check. Preheat your oven for a full 30 minutes, and then check the temperature reading on the thermometer. If your oven seems to be running low, it's easy enough to crank up the dial on your oven and wait until the thermometer is registering 400°F before baking your popovers. In addition, you might want to try greasing your pans with a different type of grease. Have you tried coating the wells with vegetable shortening (Crisco)? 

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