using weights snap or inline to get crank baits down

[bdrieck]

1st year trying to troll on Erie. using DDHJ-12 and bandit Deep walleye cranks. If I would ever need to get them to run deeper how does one calculate the snap or inline weights and line leads to get approximate desired depths. I've seen all kinds of posts about leads and I have precision trolling data book and app. I see the 50-50 method for harnesses. just don't see a lot about using weights and cranks. I've posted below from cabelas website. anyone find this to be accurate?

Snap-Weighting Crankbaits
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Placing just a 1-oz. snap weight 20 ft. in front of your favorite crankbait increases the diving depth of that lure about 30%. For a typical crankbait that dives 15 ft., 1-oz. of extra weight increases the diving depth to 20 ft. Using snap weights there, is no limit to how deep an angler can fish his favorite crankbaits.