The shift points are where they should be and it holds gears fine but it always shifts as harsh as if I was at full throttle. Any ideas? I've confirmed there is not a vac leak and that the vac line is hooked up to the sensor on the driver's side of the transmission.

Its done this as long as I've had it as my beater but I'm trying to make it better.

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Current fleet:
1995 C36
1989 190E 2.6 5 speed
1974 450SLC
1988 5.0 swapped Supra