RE: centerpin weight formula
Don't over think the shotting patterns. At least when it comes to steelhead. When I started I thought I needed all these shot lines and spent all kinds of time and money putting them together only to find out that all you need is a float on your mainline then a 3 bigger shot on the mainline and from there you tie your swivel and then leader with a couple more shot. That is the setup I use most of the time. Blackie is the one that showed me that and it works wonders you have to remember your fishing for steelhead there not the smartest fish out there.