The avoid RPM ranges (except for passing through) were; 7800 to 8650, 8800 to 9200, 10350 to 10650. These ranges were not hard to avoid as there were no operational or performance reason to set a power within them. Full throttle governed RPM 10750, climb power 10650, idle power 3000. All the "standard" power settings were easy to set outside the restricted ranges. In the circuit, after takeoff climb 9500, downwind 7500, base/finals around 5500.
I think these setting are correct, but it is 50 years since I last flew a Vampire, perhaps an indication of how well these restricted RPM ranges were drummed into ones memory.