Hi HaBaSm,
It looks like the badly non-vertical imagery around Buxton has lead you to choose a large offset eg -8.2,-0.8 ? on Bing imagery for much of your mapping.  This kind of offset is only useful temporarily while tracing roofs of a certain height at the town centre, and never for ground level roads, paths etc or at other places where the imagery is non-vertical in a different direction.  For ALL other purposes, the (ground level) offset for Bing imagery looks to be pretty consistently around -1.4,-0.7 or within a fraction of a metre of this around here.
You can check/set this by turning on the 'OSMUK Cadastral' overlay and aligning ground level features (there are usually some pavement edges or low walls around to pick from, avoid anything taller).  Then you can deal with anything taller by tracing around top/gutter line (ignore anything locally taller/shorter like gable or local low roof and imagine where the building would be if flat) then drag the resulting shape to the base of the visible walls.  Don't be tempted to follow the roof one side and the base of walls the other.  If it's right, it should look equally decent with Esri or Bing imagery, although the Bing is clearer. Also the 'q' key will square buildings when you know they are only supposed to contain right angles (typically domestic buildings, garages etc, not many old Buxton buildings though!). I've tidied some stuff back to nice alignment, so all is well and don't be put off.  Please feel free to reply/send message if you need any help/clarification. Happy mapping, Cebderby (Clive)