does any one have a rule of thumb for how far a lure will sink @ trolling speeds, with different weights, and how how much line needs to be payed out?? gotta new boat and have never had a gps but we always trolled at 1000-1200 rpm with 16 oz in line sinkers this usually got results. Im a bit clue less now seem like im going to fast @ 3-4 mphas indicated on gps