Might have somethign to do with the thickness of your beard combined with the sharpness of the razor...I only use one at a time. , but I am not a blue beard kinda guy either...I can grow a goatee and stache in about a week, but it takes a couple weeks to grow a full beard..Stiffer beards require different treatment.
And the sharpness counts too. A pure wedge is a more difficult shave in my book. Ican never get the angle correct. So, I would probably finish with a hollow to finiese the hacking I did on my face.