Amen, heliman

But if you don't want to own a whirli-bird try the following:

FIRST. LOOP-the-LOOP until you can do it within a 'box'. I mean PERFECT every time, all loops the same size, ending and starting at the same altitude.

SECOND. Point-roll. Try 4-point rolls. (Hard with a trainer sometimes because they try so hard to 'auto level', though your airmadillo should do it). Check for your points executing along the flightline at consistant points. In other words, you're wings level HERE, then 90d HERE, then inverted HERE, etc. Work on consistancy.

THIRD. Same thing, 8-point rolls.

FOURTH. If you have a fire-breathing monster of an engine you can try turkish rolls. Hang the plane on the prop and just let her stay there. T. Rolls are beyond me at this point, so get some advice from local gurus on how to pull them off. Your airmadillo might actually pull them off with a piped engine. Dunno how much it weighs.... Note that they look better on bigger planes...

FIFTH. Work on overall smoothness. Things like consistant altitude through your rolls, snapping to precise 90s and 45's through your 4 and 8 point rolls, respectively.

I will say that I personally watched one of the world's best whirli-bird operators. He was simply amazing. EVERYONE ELSE THERE had a NOTICEABLE amount of work to do to get CLOSE to him in aerobatic skill. Helis always have a challenge for you. They can do amazing things if you have the money/time/heartburn medication required to 'get in' to them.