Titleist makes a 50-12, 54-14 and 58-12.  

I carry 50-08 (bent to 49 and shortened 1/4"), 54-14, and 60-10 (bent to 59).  I'm actually in between being a digger and being a slider.  The GW and SW are Spin-Milled c-c and the LW is SM4.  I do great out of greenside bunkers with the LW.   

My guess is you play the ball back in your stance and your head is slightly ahead of the ball. 

Was he fitting you for the newish Edel Wedges?

I know they like high bounce and no one makes bounce like the numbers you stated above. Of course, they also have lots of grinding to  make effective bounce much lower.

The SM4 is a fine wedge - the M grind may suit you as it is versatile with higher bounce - get to a Titleist fitting or demo.

I have an SM4 60-10 (bent to 59-09) with the M grind.  The leading edge appears to have the same amount of bounce as a 54-14 (which is a full grind wedge).   It is fantastic out of soft bunkers.   I play the hands more forward on a tight lie (apparent "back in the stance"). 

The Spin-Milled c-c 54-14 also can be hit in a soft bunker or off a tight lie.  The narrow sole helps on tight lies.