I agree with allot of what was said here but I don't think small hotspots work near as well as the big ones. I fish Southworth allot also and I think motor mooching a fresh herring is better than any troller does. The key is you won't catch as many fish but they will be bigger. Just use a 6oz and a really long leader and go ultra slow side to side with the current. Work it too justy don't let it sit in the rod holder you need to be constantly working that bait up and down.

As far as getting down goes Ben I have seen some releases which let you troll with up to a pound of lead but when a fish stricks it pulls back against the spring and releases the lead.