So I'm about to spool up my first reel for spey fishing, but I'm not sure how much backing I want to have put on. How does one calculate that out if the manufacturer only has standard line specs? I will be putting 30# backing on. Here is what I have: Abel Super Series 11/12N (11wt. - 300 yds) or (12wt. - 250 yds) Airflo Ridge Line Shooting Line 30# Airflo Skagit Compact 600 grain Suggestions? Thoughts? I'm very new to the spey game, so any feedback greatly appreciated, thanks!!