The CG recommended in the manual is an excellent start point for the Radian so I suspect something else is going on here.
Sadly - I think JetPlaneFlyer is correct - when you are new it is sometimes hard to tell what the issue is, but as a general rule on first flights with no training help it is commonly pilot error.
For example - Tail heavy (not nose heavy) is what causes airplanes to want to loop. And tail heavy is very bad.
Mike
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