Yes, I have some ideas that will instantly ruffle the feathers of many Fox 35 pilots. However I flew them many hours for 20 years and while I started out all wrong, later in time I met some real engine people and they pointed me in a very good direction.
10% nitro is high for the foxy lady (she's a rather cheap date ) however if you add another 4 oz. castor to that 25% oil (???kind???) fuel, you may get by OK. Edited to add: Assuming you have a gallon.
Now get yourself the widest blade WOOD 12-6 prop you can find, and cut it to a 9-6. Balance it well. Be sure to trim off the trailing edge of the prop so as no danger of cutting a finger when you flip the prop.

When you have it set up to run on the stand, open the NV until you can blow air through it easily. Hook up the fuel line and choke it by covering the venturi with a finger while flipping the prop. When fuel comes up to the NV, flip once more. Now turn on the glow plug (BTW if you can find one use an Idle bar, McCoy 50, Fox, K&B in order of preference) and using your thumb and first two fingers rotate the prop rather fast. You will feel a "BUMP". She is ready to play! Flip smartly and the Fox will definitely start on that flip after break-in. Now you may have to use your imagination. It starts and fades -- too lean. It starts and dies quickly, probably too rich. Once you keep messing around, it will start running. Run for only a 1/2 minute and let cool. After a few short runs, be sure to get a RICH setting, then go to work. After a few 1-2 minute runs with cooling periods between, you can tune for a very rich setting then start and by GENTLY and SLOWLY pinching the fuel line allowing it to get fairly fast then releasing, you will heat and cool, heat and cool and keep this up for some 25-30 ounces of fuel consumption.
This procedure with the small prop will prevent the head from warping and will break-in the engine much faster and much better than running 3 gallons of fuel through it at simply a rich setting. It's the constant temperature change that does it. Soon you will be able to use the proverbial 10-6 or 11-4 and sustain a run on the verge of the 2-4 break. By then the foxy-lady is ready for real performance.
Now if you really want to blow their minds, get an OS 35-40 NV or Enya same, and swap out that fox standard equipment. Rotate your spray bar until the ONE hole in that spray bar is just a hair out of sight facing BACK parallel with the crankshaft. This is not a carb. so select the area of lowest static pressure and that is it. Your fox will perform extremely well in the stunt patterns.
BTDT many years ago. Getting set up to do it again.