Do I need a restrictor??

[crum86]

Finally got the system up and running today and did a manual test with the jets installed in the intercooler pipe and there seems to be a LOT of water being sprayed in.
The engine is a Nissan RB30 which is running 6 x 750cc injectors and about 22psi of boost (might wind up to 25psi with water/meth). The car is making about 530hp at the flywheel currently. I plan on running a 50/50 water meth mixture.
I've installed 2 x 1.0mm jets in the intercooler piping post intercooler. Do I also need to fit one of the restrictors which came with the kit?
What I've worked out is:
750 x 6 = 4500
4500 x 20% = 900cc
1 x 1.0mm jet = 450cc @ 140psi (165psi - 25psi boost)

Total of 900cc means I need to fit a 0.9mm restrictor in the FAV??