The Troll Master App is now available for free, and the free version currently includes Bucktails. This should help take the guesswork out of things!
The app lets you pick from monofilament, braid, or leadcore lines and add trolling weights as desired. The app has been out for just over 1 year now.
To download the app, just search for "Troll Master Depth Calculator" in your app store.
Check it out and let me know what you think!