If switching to the dual fuel rail wouldn’t you look to run say (8) 1000cc or perhaps smaller injectors? From my experience and reading on the subject the larger injectors tend to be rough for daily driving due to using only a low flow rate through huge injectors, which using more super-sized injectors would not help as the problem is large injectors are best at regulating large amount of fuel and not so good at regulating small amounts of fuel used at light or partial throttle conditions.