Looks like you got some really sound advice here. The nitro content for a .46 engine can be up to 15% without any problems. Although the higher the nitro the hotter the burn. 5% works pretty good also. Some places in Europe wont let them burn any nitro and that works also, hence the spike in electrics in the past 10 years.
I cant speak for any other fuel but I know for a fact that Morgan fuels do not require you to use any additives or after run products, it's all in there. As a matter of fact they tell you on the bottle not to use any after run products while using there fuel. I was given 2 bottles of the Byron brand fuel this year, 15%. I have been using it in my heli's and airplanes from .36 2 strokes to my G-2300 and all points in between. I have a lot of planes and 2 and 4 stroke engines. This fuel seems to be very good, I like it but it does run a little hotter so I added a tea spoon of castor oil from SIG to my last gallon and it seems to cool thing down a bit. I usually run 5 to 10% Morgan fuel but hey it was free and it is good stuff.
Have a blast this summer and be safe.
Happy Landings,
The Doc