getting the most of the Vf34 ur really gonna want to be pushing around 21psi, u'l def need to upgrade to a set of pink injectors.

If you dont want to upgrade,then id reccomend buying your self a TD05-16G they are similar to the Vf34 (not ball bearing tho), and dyno plots iv seen over on nasioc suggest they push similar grunt - albiet lower spool time.

34's give great mid range torque.

I ran chopped injectors for a while - had enourmous difficulty trying to get them tuned properly. Id stay away from them.
They become open taps at higher revs...