Ahh yes, but those front runners making big power on the twin Hitachis are big big dollar builds.
My old race motor, 2.9 litre L28 with standard crank the longer rods for a stroker build and custom pistons to replicate the Mitsubishi pitons that was in it originally, with N42 head that had some work done a 72 degree cam, running a L28 log manifold and Haltech F9 computer made just under 200HP at the wheels on the dyno used to set it up after the last refresh.
It made peak power at around 6800rpm, which all the experts said it should go harder, but made torque from 3500rpm all the way to 6500rpm in a very flat curve.
The build cost for that motor to start from scratch would be less than $10K
The big boys in Sc would be spending a lot more than that to play up the front.
I know Jason's L28 in hos old 280Z for Sc was a bit more power, but to get that there was a hell of a lot more development undertaken compared to my dunger motor in comparison.
In short, yes, triples will be an improvement, but they must be set up and tuned to suit the motor.
If the Sc guys were allowed triples, they would be getting a fair bit more power out of their motors, and consequently spent more money redeveloping heads and so on, or buying teh motors from someone who already has done the development.