I don't think you'll get much improvement using alcohol with nitrous instead of racing fuel. Alot of racers that are on alcohol as a fuel source still use racing fuel with their nitrous. IMO I think nitrous systems were designed to use gas and if you were to use alcohol with nitrous you would need bigger solenoids, fittings and lines. JMO
I don't change my carb jettings from running nitrous to running without.