Great write up Neil!
A lot of these restrictions were present on my 350Z, it did change the performance of the car when I had swapped everything for aftermarket, but the big change was wiping the ECU for new software. I think I only saw 30bhp after spending loads though, trouble with NA engines.
That said, if in the ISF there may be 100bhp to release then it may be worth doing!
When you getting the F?