Does the heated bed of the X1 cover the whole plate, been finding with narrow prints at 230mm fine but 240 or 250mm right up to the edge the prints are lifting on the ends. Textured or cool plate?
it would be a good idea to have some temperature measurement capability. For the bed an infrared gun works well, for the extruder a miniature thermocouple on a DVM has been reported to be successful.
The infared gun is a good idea. I have a cheap one so will give that a try and see what the edges of the bed read.