The 7 port is not the best choice for truggy because you need to take advantage of the wide wheels and traction and you need a engine that puts out a lot of low end power to accelerate hard out of the corners, races are never won on the straighaway always in the infield and judging by the videos the tracks you race on are large but very tight and technical.

If 10 min. is mandatory then I would say .21 5port would be your best bet, but I cannot promise you it will get 10 min. there are many factors it takes to get a car to get 10 min. run times, a lot of things most people don't realize like a free drive train with new or ceramic bearings, a very smooth throttle finger and a restricted engine. Also track surface plays a big role as far as the traction level and if there is a lot of wheelspin, the first track you posted looked a little on the loose side. If you are new to racing I would say getting 10 min. out of any engine will be difficult.

I would also say you will need to get the Go 801 pipe as that will give you the most runtime out of the 5 port.