We would typically pull yeast before adding finnings and cold crashing. That being said the tanks were conical and it was easy. I would start by building a starter and watching how the yeast behaves.
Also, if it isnt a special yeast I would just start over. Yeast is not super expensive and can make or break the batch.
Next time try siphoning a bit off into a clean and san mason jar to build a starter off of before adding gelatin. Just in case gelatin does have an effect