For sure, tip balancing is most important but to eliminate all vibration from any prop the hub must be balanced also. The bigger and heavier the prop the more you need to have it totally balanced IMHO.
ORIGINAL: scratchonly
By my calculation, at 9000 RPM your 1 1/4" hub is turning 33.5 MPH at the outside circumferance. Your 16" prop tips are travelling 428 MPH. This shows little chance of your weights flying off, but does it not show how much more important tip balancing is? Any correction of my calculations are welcome.