Low reverse band adjustment?

Humm so Either tighten the band untill it can just spin when not applied and or resrtict the fluid port to slow it down. the restriction sounds like the best first option. do you think I could do that with the trans in the car. I have a lift so getting under there is no problem. I have a spare trany so I will pull the pan valve body and the servo piston and look at it. Thanks for each and every suggestion.