Here's the collective word on bigger injectors:
Some report they were fine with 19 pph units, most notably David Z who was putting out some serious power N/A. He did gain improvement by increasing fuel pressure while on a dyno (which tells me that bigger injectors would have helped).
Personally, I maxxed out my 19s on the dyno at ~190 fwhp (and above 6000 RPM), which is what my math told me is in the ballpark of what is to be expected. Of course, I had other problems at the time (most notably excessive and erratic spark timing), so they might have obfuscated ($10 word for you there) what was happening with my A/F ratio, but no amount of adjustment would get my A/F below 13:1 in that range with the 19s.
The only time the 19s could be a problem IMHO is at WOT at the top end of the RPM band - around town driving is well within their capabilities on this motor.
