Beth,
It sounds like you might have over blended and filled up the tooth of the paper with too much pastels, especially if you are using soft pastels. Wallis paper can hold up many layers of pastels without giving the problems that you are describing.
You can lift all (or some) of the pastels off for that area with a bristle brush. Try to layer your pastels from hard pastels to soft pastels. If you know that you are going to do a lot of layering, then initially apply the pastels with softer pressure, and increase it towards the final stages.
Try to not do too much blending whether with fingers or anything else at the beginning or throughout the painting. Rather, leave it to the final stage. This way, you keep the pastels pigments looking much fresher, as well as avoiding pushing too much pastels into the grooves of the paper.
Mai
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