My wheels were 16" Titanium multispokes and balanced fine, the wheel wobble was always there even immediately after new tyres & balance though.  I suspect the hubs were probably warped but it wasn't worth the cost of changing them until the bearings wore out...which they never did under my ownership.

I've also got a wheel wobble on the Golf.  I do have a dodgy wheel weight on the back though (stuck on with blutack as a temp fix 14 months ago! ) and a slightly dented rim on the other side (doesn't lose air so I've just left it).  It's previously been in a front end impact though so the subframe may even be out of alignment.  I'm determined not to spend any money on it though...most people seem to put up with various vehicle faults so that's the approach I'm taking with this after all the money spent on the Focus' to try and make them 'perfect' lol.

Did he say what the dpf pressure was? 

Not sure what year your focus is but there was a wet system and dry system. If its wet check the additive tank is full.

check the dpf pressure pipes arnt cracked

Theres a few things to check but usually they require a new dpf.