Barry, i still need to tune my flying surfaces to do a great flatspin, a more forward cg changed the way it does them, my 60 never did good waterfalls, but i will work on them and finally with the forward cg the landings were some of my best ever,(i think flying and landing my edge helped)
the most fun i ever had with my 60!!

Doug, pull the carb and look for crap in it, dont take much to do what you are explaining.(may be a piece in the needle barrel, mine did that and that is what it was

here are a couple of pics