My personal thoughts...
Assuming worst case scenarios (ie most possible airflow through engine - highest boost, highest atmo pressure, most heat soak etc etc) I don't think an injector duty cycle of 90-95% is as terminal as people make out.
Most injectors are capable of running at close to 100%. Although not ideal, it is not the most disgraceful scenario that people seem to think. I would not choose to map a custom fuel setup with 100%DC however (more like 75%) - It's nice to future proof with a little headroom. However, if 95% is the worst the injectors will EVER see then I would not be overly concerned.
I've been in discussion with one particular UK ecu manufacturer regarding a completely new custom ecu (plug n play) for the Supra as well as another car I am working on, and they have some interesting opinions on injector duty cycle and fuel pressures. 100% duty cycle at total worst conditions for det and lean-ness is not considered terminal.
As for fuel pressure, I believe that the touring cars (not sure if true for the current season) have to run the stock fuel injectors. The likes of the Nissan team would run a comfortable 100+ psi rail pressure with no ill effects on longevity or spray pattern with the stock injectors. I think the Nissan injectors we're pretty impressive though in this department (reliability); might not hold true with the Vauxhall's for example.
Something to consider perhaps with all the talk of "band aid" increased fuel pressure solutions?
*I am not a great fan of rising rate fpr's though. (I don't mean boost referenced types!) This in my eyes is a little bit of a bodge and makes mapping quite tricky. However, in some cases it does do the trick and serves a useful purpose.
It all depends on your aims, what you are happy with and how much you have to spend.