After running the formulations of two different set of data on standard Excel Solver Add-in, we have got result for each set and made new, optimized block schedule.

Small Trial (Data from reference): 

S = 343 total weekly OR hours (87.39% of total utilization).

Block Schedule

Large Trial (Data from Bone Hospital Center):

S = 465 total weekly OR hours (97.21% of total utilization)

Block Schedule