Hi.
Probably everyone with both the “blue” and IR xTool heads 
There’s a recent (short) thread with one -perhaps the only one- solution:
The solution is to measure and adjust accordingly.
As @jkwilborn said, the focus is most likely off.
The focus arm on mine is (or more precisely was 
) ~1.5mm too long.
I haven’t had the possibility to find out exactly, but I will in the near future.
And I will also reveal my take on an adlustable focus arm in form of a technical drawing.
In short, I hacked the tip of the arm and drilled and tapped the stub for a M2-0.4 allen bolt.
Another IR head user reported 1.6mm of excess lenght.
While 0.1mm might not sound like much, trust me, it is with this IR head.
At least if high accuracy and good contrast in photographs is required.
And furthermore, if any kind of speed is required, 2W optical power means there’s pretty much no power to spare with out of focus beam.
That very narrow focus range means also that a special care have to be taken with the workpiece to be absolutely flat, and the working surface has to be absolutely parallel with the laser head in every point.
Otherwise inconsistency is all that can be expected.
To find out the correct focus, just a simple ramp test is needed.
200mm and 3mm (or eqvivalent imperial units ~8" ~1/8") produce accurate enough results IMO.
How You decide to correct the focus arm being too long is entirely up to You.
For my tests I simply raised the workpiece (aluminium offset sheet) by 1.5mm.
Regards,
Sam