I am glad to hear that at least I was not the only person who had this problem with the CMP .50 zero. A YS 110 in a .50 size plane and the thing still wouldn't balance! My YS 110 will power any of my 120 size planes with authority.

That fact, coupled with the others at your field with similar problems should suffice in putting the manufacturer on notice that their design and or instructions are seriously flawed. But, they already know that because they have had other complaints about it. I'm sure. They will not acknowledge it however, because they do not want to comprimise profits by making good on the poor product that was sold and do not want to spend money in changing/updating their product to make it any better. They are happy to continue to sell their product(s) to new and unsuspecting consumers without dealing with any of the fallout of all of the modelers who have been duped into buying a knowingly substandard product.