We're already at 11 changes:
Nemesis:
*Fatal Mutation now has full invincibility and grabs in a 360 degree circle; places opponent in a crumple state; startup time reduced to 10 frames.
*Biohazard Rush now has hyper armor on frame 1 until recovery; startup reduced to 8+1; vertical hitbox increased; recovers sooner to allow for post-hyper combos.
*Bioweapon Assault now better at predicting where rockets should fire; recovers sooner, allowing for post-hyper combos.
*c.H super armor changed to frames 8-27.
*s.H super armor changed to frames 7-24.
*Launcher Slam L is now +2 on block.
*Minimum damage scaling for hypers changed to 60%.
*qcb.S now fires a downward-angled rocket that hits the corner at full screen.
*Clothesline Rocket L: 26 frame start up, 0 on block(no rocket, soft knockdown); previous L and M versions moved to M and H, respectively.
*c.L now chains to s.L.
*Launcher Slam M now has armor from frames 8-29; carries over to the assist version.
Assists: Launcher Slam M, Deadly Reach, qcb.S
If someone wants to change the rocket, it's going to be hard. I think it's fine as-is with the explosion (10 hit points). Nemesis is not a keepaway character, he doesn't need to win firefights.