Great song, easily top 5 in my Chapter 3 song ranking. Annoys me to the deepest depths of the cold heart of space how it has such an odd tempo. Makes it hard to reference off of for covers when it slowly goes offtempo. Thanks a lot, Fox.
That sounds like a 
You Problem
I have the same problem.
I’ve been trying to use a rounded version of black knife (like kinda soft and light) For deltaskew Vs. Lancer, AND THE TEMPO MAKES NO GODDAMN SENSE
if i recall correctly, black knife is pitched down by 4 semitones
this may help: https://www.youtube.com/watch?v=wVyedpzFRyM