Blade + Rubber suggestions

[Quatro]

I currently have this two setups:

• Fextra 7 (7 ply wood, off -) + DHS PF4 + Mercury II.
• Gewo Power Allround (5 ply wood, All) + Sanwei Ultraspin + Sanwei Taiji.

I find the Fextra setup to be a lot slower than the Gewo. Do you think that it’s because of the rubbers I’m using or is the Fextra a rather slow blade?

I've also bought Loki Rxton 3 (blue) + Rxton 1 plus. With which blade would you suggest that I use them?