While I never flew a WACO, I had a WM Ultimate 30 and if I had a word of advice, I would say two things.

Firstly- I would make sure the CG is on the nose end of the range. A few millimeters difference on such a small and sensitive plane is the difference between a gentle flyer and a crazy circus act.

Second - Don't prop it for speed. I had a 32sx with a 9 x 7, recommended by my friend at the field over my original 11 x 5. I can say it flew terribly with the higher pitched prop. But regardless of prop... fly her slow, first... otherwise she will bite.

In terms of flying, you shoul definitely have a spotter and fly on a calm day. I maidened on a cloudy, windy and gusty day and I couldn't tell if she was upside down, going away or toward me and almost lost her multiple time. Couldn't get her grounded because her CG was so far back that even at half throttle she could maintain a knifeedge with no rudder input. Scariest thing that ever happened to me was to have a plane that WOULDN'T come down!

Anyway, none of this is the least bit scientific... just my experience. Good luck with your WACO.

By the way, I saw a WACO the other day, I wasn't impressed with the finish, it is my LHS or are all the WACOs finish not so clean?