"Best" mixture for port water injection?.

[Pit Viper]

I realize this is an old topic, but I wanted to get a little input.

I have 2003 Dodge SRT-4, with a 2.4L turbocharged engine.

I'm currently running an Aquamist HFS-5 system, with a 4-scroll 0.3mm nozzle (98cc) at each intake runner, and a .5mm nozzle just after the intercooler. I'm running 680cc fuel injectors.
With this setup, I'm still getting some knock running a 50/50 mix of water/methanol and 91 octane fuel. Unfortunately, that's the highest octane I can get here, other than race gas.

Would it make sense to increase the nozzle sizes at the ports, and reduce the one for the air charge?