I would wait until you are certified to be honest. When you start out, you will be getting a lot of AMC work, since that's easier to get. Most AMCs that I am paneled with do not accept licensed appraisers and have minimum certified requirement.
But I suppose it might depend on where you live. If its the Seattle area you are SOL because no one will hire an appraiser that can't appraiser more than 1 million, but on the east side of the state such as the Tri Cities, Spokane, or Yakima you might since prices are much lower?
Things are also very very slow with appraisal in Washington right now. If you are licensed, you may be on the bottom of your clients lists to contact for appraisal work because of the license level, and may not make enough money to live off of versus what you are doing now with your current employer, even certified appraisers are finding it hard to get work with the slowdown right now.
Another factor to consider is that those extra 500 hours with a mentor might really help you. Despite other states lowering their experience requirements, I do think that extra amount of appraisal experience is necessary to understand enough to go out on your own, especially on the west side of the state where things are more complicated.
There are not going to be any licensing changes for a long while. Washington State just amended their appraisal requirements last year and are sticking to them. Those education requirements you have are part of the final changes. Basically Washington decided to keep all experience hours requirements, but elected to modify some of their education requirements.
Someone mentioned job security, stating what if something happened with your current employer. If you have your licensed requirements and all your logs signed and in order, and you are let go from your current job, you could always apply for licensed level as a last resort anyway.
I think you may be in the position I was in about a year in where it seems to be taking a lifetime to get through the experience. I remember feeling very impatient and wondering when it was going to end.