Sounds like you are good. So just playing with the bed now. My bed can give crazy 2mm difference left to right until i get it in the sweet spot zone.
Make sure the eccentric nuts are done up 'just' enough to remove wobble. Too tight and they wear out rapidly, meaning you will get slop back quickly.
Its clear the back left corner (where the cable connects in) is my main issue now - I will play with the nuts a little more to see if that helps. I can't be the only one who has had this though Any trick to getting resolving that corner?