Stock the gap is about 0.054" or 1.37mm. However, with a blower you need to step it down to avoid misfires. There's no "set" value for blown motors though the generally accepted value is right around where you are now, 0.032" or 0.81mm.
In theory you should run as much gap as you can while avoiding misfires. People's experiences have shown that on mildly-blown apps using stock coils that gap is right around 0.032-0.035".