i still can't beleive you even bothered to get the 30DET tuned at all with an RB20 turbo, but i guess you just wanted it running ASAP which is understandable. as a comparison, a friend of mine had an RB30DET and he was using a TO4E with a big front wheel (can't remember exact specs) but get this: the rear used a 1.33 a/r. the turbo was off a big HP rotor, but the 30DET spooled it to 20psi by 4000rpm. boy did that thing have some stink in it.
in short, you can run quite a large turbo off these buggers and still get decent spool time. of course, being 3 litres, high compression and twin cam, you probably won't even notice that it's off-boost most of the time.....
in a few weeks i'll throw up some pics of my engine in this thread, you guys might be interested to see just how far i am going to reduce lag