Lazy.

It will do right flats but left are better for some reason.

If you are looking for an upright left flat spin, just give it full left rudder, left ailerons and up elevator at first. (just like swany says) wait till it gets into a downward spiral, the wing will be leaning into the turn (left tip down) gently feed in right aieleron till you see the wing flaten out, the tail should come down too and it will lock into a tight flat spin, and will hold altitude.

If the tail is still up, it is nose heavy. This plane will not flat spin if you have the CG "on the mark". The CG specified in the instructions is nose heavy

1/3 throttle is fine to start, add more in the falt spin and thte decent will be slower.