Jet size questions - WRX

[bwhinnen]

I've used the 'lovely' PHPBB search facility and have found a few entries of the jet sizes people are using...

But is there a specific formula to use, I understand that 10 - 15% of the fuel used is the guideline, but given that the fuel used across the entire rev range will be different is it a compromise?

I run 4 x 700cc injectors at about 68% IDC (@ 7000rpm), currently around the 199kW @ the wheels mark.

Currently I'm using the 0.5mm jet in a 1S system but would like to know if running a 0.7mm jet as a few others are using would be a better solution.

Jet location is in my FMIC piping, about 700mm before the TB.

Cheers and thanks
Brett