You have to forget the idea that more ports will give more power, it is more a commercial statement than a real technical/performance statement. In a 2-stroke engine timings and dimensions are the most important factors for performance, not the amount of ports.
Beside that, matching materials for piston and sleeve as also the precission of which they are made will determ a huge part for the performance.
3-port engines can run as fast as 9 port engines, I think the .12 touring cars did show that already for years.
Regarding power and consuming, that is for the most part an exhaust thing. Just get a 2013 exhaust and you can reach 5:30 with the 35+ engine. Getting more time is not only a power issue, it is how you setup the complete system:
- exhaust (type)
- manifold (conical or not and length)
- backpressure (there is a lot to play with)
- type of carb needle (yes, there are other types)
And yes, it is possible to get more runtime after tuning the engine. A better flow and different resonances inside the engine can create less loss of the mixture.
Speed is only fiction but a 130+km/h MRS4 is for real.