Well I have solved the problem, and it was quite simple really, my engine only wants to run on 10% nitro fuel (which is what I ran it in with). Many people told me that it shouldnt matter, but in this case it did.
What fuel do people usually run their engines in on? I have heard you should run in on the same nitro content as you want to continue with, but then the run in fuel we have over hear is 5% nitro with high oil content?