Check out the stall at a good safe height. I'll bet it stalls and lands at a much slower speed than you expect.
Also, make sure you have enough flap for landing, at least 60 degrees.

My own similar (but far better looking) jet trainer JayTee has quite big flaps that deflect 60 degrees. Without them it floats forever, but with full flap it lands really slowly (for a jet) with a short rollout. Using data logging I found that my typical over-the-fence speed is 27 mph, and touchdown at 22 mph. Top speed in level flight flat out on a 14 lb Wren 54 is about 125 mph.