yes I am using a formula for spinners at 1.5 MPH,if you go 1MPH or 2 MPH it wil change little,that is not big deferent.
you can not do that with 1 oz or 2 oz,you have to look at chart all time,they make big change from 1 MPH to 2 MPH.
spinners,shalow divers,floters follow the 3 oz very close.
if you target 30' dept, use 1 oz inline and go 1.5 MPH,you have to look at the chart and set the dept.
if you have current agains you,your 1 oz is higher 10' to 15' than what the chart is saying,
the same condition effect 3 oz inline maybe 5',that is much beter ges then 1 oz.
the deep divers 10/10,20/20,30/30 is very close.
the 40/40,50/50,60/60 you relese 10' les line to be on target,if nothing happen you relese 10' les line to be on target.
when you set up 4 rods,you set line release 50',60',70', 80' not to find where is 30' dept but you cover 30' dept,looking for active fish,when you find active fish than you make adjustment with rest of the rods or you steel testing for best bite.
I like your compromise,i am looking for easiest way to fish,simple and injoable not a job.
with this system you do not have to know anything about trolling dept,you start with 20' relese line and every 20 minutes you drop 10' more line,before you cover all water you will catch fish,start on top or on bottom,you do not have to remember anythink only 10' higher or 10' lower the line from real to inline sinker.