It will run fine on 5%, it just likes higher nitro as well. I ran mine on 5% for the better part of a year, no problems.

It should be fine on a Majestic, they tend to come in under 10 lbs. If you can keep the weight down to around 9.5 lbs or lower, you will be very pleased. Even at 10 you should have unlimited vertical power. I had an 11 lb plane that would hover with an OS at about half throttle, so the power is there.

I used the standard OS header, and an ES carbon pipe. A 2C140M80 to be exact. Don't worry about tuning it, it's not necessary....but if you need more power, that's a good way to get it at SOME loss of transition. The props it seems to like are the APC 16x13W, 17x10N, and the Bolly 17.5x12.

-Mike