I was recently fit for a driver at a Titleist Fitting Network retailer.  I currently play a 909D2 in 10.5*.  After the fitting, the fitter recommendended a 913D2 in 12.0*, B-4 setting, Diamana D+ White 72x.

My questions is as follows "Would a 10.5* in  a B-1 setting have the same specs as the 12.0* in the B-4 setting (11.25* effecitve loft with face open)?"  Please note that I am left handed!

I live in Minnesota and was fitted during the late winter months after not swinging a club since November and am concerned that swing was off due to not playing.

Thanks in advance for the help.