Hi as already mentioned spey hackeling with Marabou requires some special techniques.Some form of support for the marabou is needed. One can use a palmered hackle feather or one can tie in and spin a bundle of deer hair to keep the marabou from stringing out. One can use the fold over palmer approach or one can tie in the marabou spey style.In spey style you need to use a proper feather not blood marabou and you need to trim it back so that you are tying in a fine suple stem by the butt. You should trim away the outer side of the feather for the first 1/2".
All spey hackles and for that matter palmered hackle should be counterwound with thread to trap the stem in case it is severed by the fishes teeth.
Most jigs are improved in both appearance and function by the addition of a small amount of crystal flash .You should leave enough space above your marabou to tie in the butts of crystal flash with the tips over the head ,then force the material back over the marabou and tie in a head with several turns to hold it back and flaring as a sheath over the marabou.
coot