I just learned this on Jims, THe prop should stop ALL DIFFERENT POSITIONS On the balancer to be balanced. I did what you are doing and did it dead even across.
I guess thats not the way to balance, they are to stop at all places. and yes the heavy end will drop, but i would think if its in the middle and balanced your good, Need to look into this and find out the best and real way. I beleive what i have been doing is right, but after reading what a guy posted, its wrong.
Tom