Jussi

I just reread your post and realized you are using 4mm wire struts (equivalent to 5/32" ) That may be part of the problem. You need to drill out your yokes and install a stiffer wire. 3/16" (4.76MM) is the minimum that I would use. The retracts you are using are for about a 10 - 12 pound plane. I'm sure yours is a little heavier than that.