I would get the static compression as low as I could and spin hell out of the blower. Never made any sense to me why guys build a high static compression blower motor and then under drive the blower. Work that puppy. That's why you bought it.
Because you can build a 10-1 or a 11-1 engine, work the blower to death and still run pump gas in many cases. Ignition timing comes into play and fixes everything except exceeding pump gas limits inside the engine. If that happens, back off the blower pressure.
