I believe that is the only way to get a meaningful jump in pay is to switch companies. Also there is a danger that your existing company that does not want to pay you a meaningful amount more (20-25%) will want you to start stamping drawings for free and thats a big problem so what ever you do keep the fact that you passed a secret especailly if you have no where to jump to and dont want to be pressured into stamping with the threat of being laid off, of course if you think that is a possibility you can keep a voice recorder on you at all times and you could make a few million bucks off a law suite, pressuring people to stamp things they are not comfortable with is bad mojo, irregardless of the reason they are uncomfortable.
Well, there's a difference between being asked to stamp plans you didn't prepare / weren't under your supervision vs. being asked to stamp plans you did prepare / were under your supervision, regardless of getting a raise for being a PE. If you chicken out of the latter, I sure wouldn't plan on continued employment, which may or may not be a good thing. Regardless, how could you possibly entertain the idea of a lawsuit for being asked to perform in the capacity of a PE (if you are one), if the stamping involved plans you directly prepared or were under your direct supervision? Most people don't make a habit of stamping anything that wasn't btw, raise or not.