I read about carbon fiber replacement props after trashing 4 in one day trying to learn CSC motor shut off after landing. Obviously I gave up as I had no spares left! Each tip over snapped 1/4-1/2" off a prop. figured I just am not coordinated enough to pull both sticks down and center at the same exact time, so before they both get there, I am commanding movement with the right one and over it goes. So I learned to just land carefully and cross my fingers that the thing will not tip over in the 3 sec it takes to shut down.... So far so good. Brings me to my question. Seems everyone advertises "9 inch blades." Well, mine are (were) all 9.5" long! Is this something new? Any comments on buying 9.0" replacements? Seems to me the controller will just speed the shorter ones up a tad to make up for the loss of lift? Corollary to that then is reuse of the broken shorter ones.... I snipped off the longer end to match the shorter end and have some 9.0-9.25" long ones now.... used one and I see no difference. Will try the 9.00" long (shortened ones next). Anyone see any issue here? I have seen a zillion posts/youtubes around about "OH MY GOSH - you MUST balance each blade" on special expensive looking balancer. Before I noticed the first shortened one, I made a flight and had no issue. Later found one side was 4.75 (new length), other was 4.50"..... So since some folks seem to think balance is so critical, I DID balance my cut off ones by setting them on a knife blade in center. Comments?