You have missed the point mate, the problem is that he has peak and hold drivers (a much better solution than just slowing them down with resistors which is a bit of a nasty setup TBH) built into the ecu to run cosworth ones, there isnt a trivial way of therefore running high impedance injectors with that setup.

A bit like wheels, if you have a wheel that sits too far in you can add a space to push it out, but if it sits too far out you cant easily add something to move it back inwards, if that makes sense?