Which is more important to you? I would not continue on your current path or you're not going to be able to do justice to either.
Some people do work part-time during PhD out of financial necessity, however, I don't see how you can make time for both a full-time PhD and a full-time job. One or the other needs to be part-time to give yourself the best chance.
The time commitment required from me was extremely heavy, especially towards the end. I personally could not have continued in a full-time job (probably not even a part-time job) and done justice to my PhD.
Ian