Set the low end needle flush with the housing not just 2 turns out, it's the needle where the throttle linkage hooks up to the carb. It sounds like the engine is going lean right after startup causing it to rev high. Check to make sure the hole in the muffler where the fuel pressure line hooks up is clear from obstruction ( run a small drill bit thru it ). Sometimes they don't get drilled properly from the factory so you get no fuel pressure.

Altus RC Hobby