I had the exact same plane from the same kit and it behaved the exact same way. First time I looped it, it snapped out at the top.
I went to low rates and it never did it again.
Good flying little plane but don't get it too slow on final. That's how I lost mine. Repairable but I donated it to a teen member who liked it.
Don't get me wrong, it'll slow down pretty nicely considering the draggy airframe...but don't test the limits too low to the ground.
BTW, mine was noseheavy with a TT46...How about your's?