I can see where if the spring was just removed and the servo wasn't blocked that, that may be a problem, but since there is line pressure above and below the accumulator servo they should cancel each other out with the servo blocked.
The only time there is line pressure on both sides of the piston is on the upshift, on
initial application of the clutch there is only pressure on the case side which also supplies the clutch.
I can also see where increased line pressure could be a problem, or throwing it in drive while on fast idle or a neutral drop would cause that.
When cold, the line pressure is high even in an unmodified trans and the spring eases the shock of application.
Removing the outer spring, by itself, serves no useful purpose.
