i have all of them. the dubro works good on big non aerial video type pros, in other words regular plane models, perfect. however as soon as your looking at jello, weird imu issues, etc it takes a precise balance and the only way i can get it is with a mag balancer, topflites is the most readily available.... it is imperative to get control of the hub, i do it bay sanding a heavy lead or trail edge by rounding the face, not just flat sanding material out of my way, helps to keep it from chaning the ear shape or size to a minimum. Once the heavy ear is down, then i sand the bottom face of the blade, the big part,,,,, sand that keeping the hub centered, if it comes up, get it back down before continuing the heavy ear balance. eventualy then start sticking no matter where you let go, that means your in...... it'll fly like no other
i did this for a friend that i'll share with you guys..... this is the kloner secret to excellent flight charecteristics and efficiency.
I recently bought a dynamic balancer but am still sorting out how to use it, i intend to balance like this, get my motor balance set, then mate them both and balance them together..... i'll record before and after affects, stay tuned for when i figure the dam thing out.