kiwibob,
I've heard and seen the same thing about the blue nose. There was one in our club that went through a few pilots before it went in with no explanation. The pilot was an old time warbirder with lots of experience and thought he could tame it. Dont know what it is about the blue nose, but keep an eye out for some strange flight characteristics. Horrace's idea about setting both ailerons up about 2 to 5 degrees might help. Mine is an old discontinued P-51 I got at a swapmeet.
Edwin