For me (Lido 3/Silvia V1 with EPNW 14g basket) the Guji pulled just fine but the Arnulfo gushed badly.

I will say both coffees have been awesome in the Aeropress, so no major complaints from me.

I also found the Arnulfo to be too acidic at any temp as espresso. In the immersion dripper it was quite smooth but still has the grapefruit like acidity to it, which can be polarizing. I'll be playing with the Guatemalan this weekend.