Hi WF,
glad you like FFR.
Not exactly sure but I think you mean stripping the flue/barbules off the ends of all the feather barbs before you tie them down? Tying marabou using the technique illustrated at
FFR doesn't really produce so much bulk that it's an issue. However if it is a problem for anyone then the technique you refer to would help - it's just takes that bit more time. For anyone interested: Allowing the correct amount of space at the head and making a tapered cut when removing the waste should give a good profile for the whip finish. Using thinner and stronger thread helps; also, it's a common mistake to use insufficient thread tension and to use too many wraps, so they are things to keep an eye on. Hope these comments help.
Happy tying,
R