Its just not bad enough to warrant changing yet. I use to make walker locks and I always used the nylatron washers without any problems. Of course the knives I made were a little lighter than the dominator, but not much. Allot of it has to do with the tolerences; backspacers used, the stop pins, etc. etc. etc. If you have a stop pin and the back spacers are not the correct length that can cause blade wobble, the wrong washers will do that of course. A poorly adjusted pivot will also do that, etc. etc. etc.
Teflon, nylatron, any synthetic is going to wear some, but a folder that is poorly designed will wear much more quickly. I have never had a knife returned to me for problems with the washers. Anytime you hand make a knife you have a better chance of correcting any potential design/manufacture problems. I never let a knife leave my shop that I was not happy with, or would want myself.
Dirk, I did not realize your not far from me, a little north!