I don't worry about TTSX/TSX losing petals.
Check out Cutting Edge Raptor bullets; their monos are designed to shed petals as shrapnel flying out at 360*s from the projectile as it hits flesh. I've have excellent results (accuracy and terminal performance) with them in .308 and .375 H&H.
It seems no two shots are exactly the same, shoot enough and you'll see variations from the "norm".
While monos don't have a velecity ceiling, one needs to be aware of what terminal performance is/could be at various velocities.
As I've posted before, matching bullet design and velocity for optimal results is more art than science.
DF