I rechecked, Gladius B Blade
Buffed speed (deg/sec) while non-boost
Pitch: +0.99%
Yaw: +1.4%
Roll: +3.9%
But like I said, Blades are trade-offs, so the nerf for the same blade:
Nerfed speed (deg/sec) while boost
Pitch: -1.2%
Yaw: -6.3%
Roll: -0.8%
Edit: I inverted - and +.. Corrected now
There are also other stats, I only did the above as an example.
F.ex. the combat speed for the Gladius ship will be nerfed by 4.1% by installing the B blade...
If I did it wrong, tell me: