matador, in Canada our SAR schedule is close to the same. 9.5 days off per month, the rest is a 24 hour shift every two days, and 72 hour shifts over the weekends. We're doing that with 6 pilots (two pilot aircraft) right now, so it works out to about the same as you have except our schedule is irregular.
Normally we do this with 12 pilots but then we have many other taskings and duties.