David,
I think you lapped your ways a lot or you also lapped the dovetails or a combination of both. I had this same problem with my Y axis. The gibb strip is tapered, and notched. Inserting some shim stock behind the nonmovement side of the gibb strip will actually improve the fit better than original as the shimstock will be more uniform than the surface. Cut a notch in the gibb strip shim to match the gibb strip as in the picture below and see if you can get the gibb strip to go in enough to eliminate the play. My shim is 0.005" thick.
Here's a trick to make it easier - use a carbide point scribe to scribe an outline of the gibb strip on the shimstock including the notch in the strip and you can flex the stock to breakout the shim from the stock.
These aren't $15,000 machines and a little shim stock here and there doesn't hurt anything.
I also was disappointed with the condition of the ways on my machine and a few other blemishes on the table. I hope current machines are improved in this regard. Having said that, I am willing to work around those issues for the advantages of the large table, long column, inch lead screws and the hardened gearset. Another advantage is Aaron, he's honest, and willing to tell you the good and bad of things with no bull.
Let us know how things work out David.
Welcome to the world of the "Big Mill".
Mike