I recently bought a Freud SD208 dado set and after several attempts at making box joints I find that all sides just do not line up...I have tweaked the settings on the blades, indexing pin and space in-between and still have problem. I've also tried my router table with brass set-up guides and the Rockler box joint jig and have the same problem with all four sides fitting together. Sometimes a second pass after slightly moving the jig helps but then I end up with one side that is way off...what is wrong ? Appreciate any comments