727 B&M shift kit problem

Anytime you remove the spring in the accumulator you effectively disable it. Remember it's a cushion. When there is a spring present it works. When no spring is present it doesn't do any cushioning. And remember without a spring or blocker rod it's free to slam back and forth. By blocking it with a rod you prevent movement. That doesn't make it shift any harder than it would without a blocker rod. Just prevents the piston from slamming around causing a possible failure. My suggestion is to block it even if the throttle pressure adjustment fixes the problem but do as you please.

BTW: Did the instructions say to remove the spring or did you just do that on your own?