B4.1 Front Hex Conversion issue

[Crash]

Recently go all the bits (spindles, axles, hex's) to convert my centro over to Hex wheels but when I tighten the wheel nut it all starts to bind up and stops the wheels spinning free. Backing the nuts off a bit helps but then i get wheel wobble.

At the moment i've got a washer at either end of the axle rather than both washers between the drive pin and the bearing. Any ideas?
Using the recommended Proline wheels rather an the AE ones.