Not sure if this question has been asked and answered, I've looked and couldn't find the answer so I will ask.

I have an OS MAX 46AX in my trainer and I am getting a OS MAX 91 Surpass II with pump for my Extra 330. I have been running Tower Hobbies Tower Power 10%, with 18% oil (it doesn't tell me castor to synthetic mixture) and my 46 runs fine with it but has a tendancy to load up a bit at idle.
Now I am shopping for fuel again. I have been contemplating going to a 15% Nitro, with a 18% oil content (80% synthetic and 20% racing Castor) and here are my questions.

Will I notice a difference in the way the engine runs from 10% nitro to 15% nitro?
Will it idle better with 15% nitro?
Are there any benefits or drawback's to switching fuels?

From what I can tell both types of fuel will run fine in both engines... am I incorrect in that assumption?

Thanks,