Stan...I have a Beulah Blue Water Series (not surf rod 10/11wt) and love it. Obviously not their new surf series.
Your question is best answered by calling the company directly. I called them re lining my rod and their recommendation was 10wt for a fast sink and 11 wt for intermediate line.....their recommendations were spot on! Plus, they welcomed the call.
If the surf rods are anything like the blue water series....it is really a 10wt for the upper 2/3rds of the rod and 11wt butt section. All their rods are extreme fast action rods....they throw flies like a bullet.
Give them a call....I spoke at length with the CEO at the Bears Den fly show.....they are very eager to market their rods on the east coast....appear to be really nice folks and eager to consult.