IIRC the RoSpit went from carbs to FI and was ported along the way. Stock 12A's were ~100 at the crank, 4 port 13B's were around 125-135, the 6 port 13B's were anywhere from 146 to 190 depending on the year, the 13BT was 185-205 (IIRC), the 13B TT 255, the Renesis 238 with A/T and 252 M/T, again IIRC.
Here's the thing about porting a rotary: if you start futzing with the intake ports it isn't hard to jack the peak numbers up, but the torque curve (yeah, I know that's a joke with a rotary) gets steep, as in it has no bottom end power, meaning no driveability. That's why Mazda went through all the conniptions necessary to build the 6 port system, which was replaced with conservative porting for the turbo motors since boost made up for the porting losses. The conservative porting made them driveable on the street.
Peripheral port motors make big peak numbers but in a very narrow RPM range. They are hard to drive on the street for that reason.
The exhaust ports can be hogged out pretty big without a corresponding drop off in torque, but the (necessary) position of the port limits what you can do for port timing which is where the big HP and torque numbers are. That's why the Renesis has the side exhaust ports; Mazda finally figured out how to keep carbon buildup from causing way premature engine failure. That allowed them to use exhaust port timing to full advantage and is why the stock naturally aspirated Renesis makes almost the same power as the stock 13B TT.
Tell you what you might be able to do: get a lighter flywheel. Rotaries have heavy flywheels to make them idle nice, but we don't care about that, do we? 
The engine will pick up RPM a lot faster, even under load. If you can find a light steel or aluminum flywheel that might just add the oomph you want. I have heard of people lightening their own, but IMHO that is best left to experts.
Then there is the Miata R&P swap. Some 1.8 Miatas had either 4:30 or 4:44 gears and they are a direct bolt in to a RX7 rear axle. If you can find a late '90's Sportage front diff, they are 4:77 and again this is a bolt in. Backlash etc setup is easy.
