Hi ralph sorry I didn't get back to you on the pm but I've been very busy lately (Home, wife work) but here is my suggestion;
I would try the 5/18 instead of the 10/18 due to the fact that big glow engines dont like nitro I noticed on mine that it gets hot at 3.3 % nitro so if you use 5% nitro you'll end up having about 1.66 % nitro, as far as the oil I would leave it at 6% i'm using somewhere between 8 and 10% and still have plenty of oil left over after running, it smokes and leaves a lot of residue to clean up but is up to you wheter to try 6% or go up to 10 if you decide to go up on oil just add 120 ml or 4 oz of of any good quality two stroke oil Amzoil or Mobil MX2T synthetic and youl be ok it will mix well, but again I would try 5/18 glow fuel for starters.