PPK Results with big RMS

Hello all. Over time I have thought myself a little about how to do PPK work and created a workflow, but iam still have a few issues. My process is to process the base log files with CORS and clock data. get the base location coordinates. I then put these coordinates in to RKTLib with the rover and base file to produce a .pos file. From that then calculate the location of each point.
My problem is that the RMS on rtjplot are high and I cant seem to work out what ive done wrong could any one point me into the right directions. Thank you.

The discussion is continued here: Very High RMS