Did a bunch of it when I trash fished. Bandits mostly. The trick was if it was too bushy, it would add resistance and keep the back from wiggling right. Too much would slow the action and in some cases make the bait roll. The attraction to me is with a stop and go retrieve, where the feathers or hair would flair and settle. Not sure what it might add with trolling speed. If I did anything, It might be some 1" strips of flash-a-boo tied sparingly.

Wannabe...