Blown N2O
I have seen some people utilize the nitrous as more of a cooling agent and spin the blower a little higher. The only real concern is getting the intake charge temp too hot with gasoline. Instead of depending on a large power shot of N20, you could use a conservative amount, enough to cool the air after the blower. Put an thermocouple after the blower and monitor the exit blower temp, then try a little N2O to see how much cooler the air gets with you current setup. You will find that you can spin the blower higher to get more boost and have cooler intake temps. Setting the N2O system up with methanol will further reduce the chance of detonation and cool the temp even more.