To my knowledge most factory inlets ARE already tuned for max torque, and of course max quiet. This makes them drivable for grandad. The Broad Band is already over 100% efficient, so it's pretty much torque city. Sounds to me like your cam grind is limiting you, but at 190kw's I figure you have to comprimise somewhere. I'd personally sacrafice a bit of top end outright power, for a more drivable ( ie tourqey ) grind.
The latest 295kw holden has gone to a smooth inlet tract, which they say increases torque, so look at loosing the rubber accordian style elbows. Keep the inlet as cool as possible, I jacked mine up away from the broad band manifold so it just rubs on the bonet underlay. I also put heat proof tape on the underside. One big thing I noticed for grunt was to put an EF bellmouth from the airbox lid into the AU, noticable grunt increase. Mkae sure you sand out all the edges in the whole inlet, especially the EF bell. A mate of mine had one of these spun up out of alloy to the same length, but it doesn't taper down inside the lid - reckons it worked great too. I'm happy with the EF bolt in myself. Got an XR reg too, bit more fuel pressure for future mods, runs rich, but mid range grunt improved straight away. Feel the computer has adapted now though. E-mail me with your address and I'll post pics for ideas. I run the BA inlet, no noticable difference, but may flow more air for your application.