To check the elevator did you handglide the plane before the first launch?
A soft winch launch at first is a very good idea.
Windfree's are particularly susceptible to warps--wings must be straight and 
I don't remember if washout was called for in the plans but if so should be 
used.
I have flown several Windfrees and all behaved differently on launch. Some 
were pussycats and some were real scary. I think the better built ones were 
smoother launchers. One particularly troublesome  plane was covered with 
econocote rather than Monocote and I think the softer covering added to its 
problems.
Almost forgot--the plane MUST balance laterally for a straight launch.

Mike Clancy
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