Try playing with one weapon only. Don't even equip anything to the rest of the slots.
You're not going to be good if you try to play like everyone else. What everyone will tell you to grab a Final Flourish and Gran Faust and you're set.
It entitles that you are meant to play like everyone else which is fine but that isn't for everyone. The problem with FF/GF is that you're unknowingly trying to use both weapons either equally or just because you already have it so why not.
Play with one weapon only and discover what your play style is about. Take your time and make every action count. Having one weapon serves as a baseline of how carefully you should be playing. Analyze what you can do with one weapon. Having two weapons, you could easy switch and hit or miss again. Believe me, I can guarantee every LD'er does this. They just attack attack without even giving area to think about the bigger picture.
And this what separates from smart play and reflex play, if you don't have the reflexes to visually see and do it on the fly accurately, you need to back the "F" off and start playing like you're old wise person (slower player).
What are your other weapons? I'd use a Heavy sword (GF, DA) along with the BTB. The best thing is practice. You can also watch some SK youtubers for some tips if you wanna.