Why do zero g rolls on the B&M inverts feel less powerf

[Ayy Lmao]

If I compare montu's zero g roll to the TIC's zero g roll montu's is significantly less powerful. Why is this? Is it because of the shaping on the inverts (I noticed they looked kind of like in line twists, with banshee being the only exception)?

 

[GuyWithAStick]

I think it has to do with heartlining. On inverts, it's almost like a raised inline twist, but on sitdowns, it's like an inverting hill/raised corkscrew. Banshee's appears to be more parabolic, thus probably creating the zero-g feeling.

I don't know, though. That's my best guess.