registation of aircraft

I bought my dream plane this summer an rv-6a and the state of washington is
very happy about it because every time an airplane changes hands they
collect 7 plus percent in taxes. I,m seriously considering moving the plane
to oregon where I,m planning to move when I retire in 2.5 years. I need some
of the groups wisdom about some alternative ways to deal with this. I,m
perfectly willing to pay my share but this seems really unfair. thanks
ray in ballard