Short Runner Manifold
This is from my old engine, a1 turbos sort runner blower manifold with a m112, doesnt show rpm but rev limiter was either 6500 or 7000rpm.
http://www.facebook.com/photo.php?fbid=365046017800&set=a.365045897800.157793.722707800&type=3&theater
IV had the same problems as you! Ive currently just fitted Injector dynamics ID1000s and they are good. Nice and smooth. Think they even do a 725cc and 850cc.
I was told the 1000cc model behaves like a std denso 270cc injector asfar as idle quality is concerned, and I believe it!
Cheers.
Why not just get an aftermarket ecu that will control the vvti? then you can also play with it etc.
Linkecu.com is a great ecu, the g4 extreme is well up to the task.
Part number is 90919-02228, different again to what you mentioned.
I have them wired as per the link diagram, but as that is for a 2uz i think the coils are different. No spark so im double checking everything...