What is the general rule, if any, in determining if a reel balances with a particular rod other than a manufacturers designation? For example, I have one reel that is designated as a 5/6 wt line and another that is 3/4/5 wt line. The one designated for 5/6 balances about 1/4 of the length down the cork from the winding check on my 9' 4wt while the 3/4/5 reel balances near the winding check. Is there a preferred point on the rod at which proper balance is acheived?