Most tangles happen due to what others have said- too much line out behind clip and turns. DR line out at way to much of a scope, likely you are bucking the tide and need to be trolling the other way. I personally don’t turn all the way around when down greater than 140’ in the Strait of Georgia. Too much current. I just plan my tack to pull lines up at the end and run back to the spot to go again with the current. Know the current directions for each tide... hint, just follow the guide boats

. 15lb balls are good. 18’s or more if you have the high output scotties. Just limit or don’t do turns when down deep and try to use straight plugs (troll fast) or spoons whenever you can. Like others have said, if the bait is down say 200’ you might have to drop balls down 230’ or deeper to be effective just due to the scope from fishing that deep.
I find plugs or just spoons (no flasher) more fun and less drag on your lines when that current wants to sheer one line under the boat. Having lines doing that is fine as long as they stay clear of the prop. Keep the speed up to keep them heading back from the boat (1.7 to 3mph speed over ground). You’ll get less dogfish going faster too. Don’t slow down or have a rookie with adhd on the wheel who can’t keep the boat on a straight tack, or the current wins

.