OSE has a lot of good info on prop call outs, selecting the correct one and Andy Kunz wrote the book on balancing. There is another one I have saved on my home computer but I'm out of town. It's nice b/c it has some diagrams. Bottom line more information is better, even if it confilcts a little bit.
http://www.offshoreelectrics.com/inf...r_Tips_&_Info_
http://www.offshoreelectrics.com/inf...andbalance.php