Cheap props ALWAYS need all kinds of balancing, whilst expensive props are factory balanced by expert personnel in the production process. I have seen the cheapos out of whack on all 5 accounts I mentioned in my previous post. These cheap props are CNC machined without manual finishing and balancing. After the cnc operation there are many forces liberated in the wood that distort the propeller, which consequently does not fit the production jigs any more. Result: a cheap shaker that reduces the life of your airplane by failing electronics and failing frame integrity. 
Gassers in fact shake less than glow engines if they have the same horsepower. BUT, large engines shake more than small engines due to the larger torque pulses.