Actually you can see it on the pics if you look. Pay attention to the trailing fairing on the fuselage.

Check the pictures both on the web site and on Hambone1's post.

The wings have a pronounced positive incidence, that is purposely increased by the fairing at the back.

Mine is the same way and the positive incidence is quite noticable and purposely designed in, w/o causing the aforementioned flight characteristics.

Most of my SMALL Ultimates 40S have at least 1 degree of lower wing incidence as well. The larger ones do not.

Even if the incidence were off to say 3-4 degrees positive, the plane would not pitch up uncontrollably. ( Don't ask ... yes I accidentally flew a bipe this way. )

It would develop more lift and drag and if anything tend to stall out at faster speeds.... he would be inclined to pitch the nose down as it would want to climb fairly fast, but the plane would not go into an almost uncontrollable loop.

All else being correct, you would have to have a fairly pronounced incidence to get into an uncontrollable state... at the least over 4 degrees as I've flown with this much on the lower.

The Stearman has a good tail moment. With a light engine it is fairly easy to get the C.G. too far back.