Question Summa s2 t-series knife angle question.

[Tuanny]

Hi guys i mainly just cut wallpaper fabric material on my Summa s2 X/Y square cuts which knife angle would be best for this?
also for some reason when it cuts on X axis sometimes its not cutting as deep and accurately like on the Y axis do i need to like recalibrate?

 

[unmateria]

Replace the cutting strip or/and use a 60° knife