You really need to find someone in your area to help with it in person.

What fuel are you using? Nothing exotic or higher than 15% nitro or lower than 5%? Is the fuel new and not cloudy appearing? What prop? What plug?

Honestly, I think it's still a mixture setting problem. You need to make small adjustments most of the time, the difference between too lean and too rich can be as small as a quarter of a turn with some engines. (though the Evos usually have a broader needle setting).

What procedure did you use to set your high and low speed mixtures? Did you do a lift or pinch test?

On takeoff, it's possible to have an engine lean out and die, even though it seemed OK on the ground. I think that's most likely here. It's also possible for an engine to be too rich and do what you are seeing. There's not quite enough information.

Did the engine smoke? When it's running, do you see liquid fuel spitting from the exhaust? What color is the oil coming out of the exhaust?

While it's possible you have a bad engine, my guess is that it's just not set up correctly. If you can get someone near you to help out, they can actually observe the engine's reaction to various adjustments and tell what is going on.

If all else fails, get a tach. Remove the limiter from the high speed needle, and back it out about 2 turns. Start the engine, and slowly lean the engine, no more than 3 clicks at a time, watching the RPM change. Only change the needle when the RPM has settled to a steady value after the last change, it can take a few seconds for a needle change to take effect. At some point, the RPM will peak, and the next adjustment leaner will result in a lower RPM. That's too lean. You want to be a few clicks on the rich side of that peak. You can also do this by ear if you listen for the RPM change.