NoOne:

Sounds like you have some major errors in rigging the plane.

If you do not have an incidence meter buy or borrow one.

Following is general for biplanes, not all are set this way.

Check both wings, at the root and both tips - correct any warps you find, washout should be set approximately two degrees on the upper wing only. Adjust decalage to have the lower wing incidence two degrees more positive than the upper - along with the washout in the upper makes the stall much more gentle.

The horizontal stabilizer should be set between zero and two degrees negative, in other words from neutral to a very slight up elevator position.

Another possibility is having the horizontal stabilizer not level in reference to the wings. Sight from the rear, with the wings level. If the stab is then level to the eyeball it's close enough.

Also, if you have separate pushrods to the elevator halves, or two elevator servos, you might not be getting even deflection. While holding up elevator press the trailing edges down, you might find the "Wyed" pushrod deflecting to one side under load, giving in effect, an elevator only on the left side.

Finally, check the vertical fin. It should be aligned perfectly fore and aft, or angled with the leading edge a little bit to the left, (right rudder) but never angled to the right.

These are all possibilities, but I think most likely you will find your errors in the wing rigging.

HTH.

Bill.