some say the loop knot is the way to go ....i do know with braid it works very well when fished tandem ....
dual presentations dancing if you will in unison emulate baitfish movements well ......
i am one of those that never puts split shot on my line but i do have a bud or 2 that do it to fish real deep ....i mostly drop one jig at a time with an improved clinch knot
my favorite method of presenting jigs to crappie is under a float at various depths ...i always use a pinch on and most of the time its a thill
good luck to you on the tourney trail ....