Spring Conundrum

[RustRazor@AOL.COM]

I'd like to pull on your coats about something...

I'm regulating an action from a Baldwin grand and have run into a rather odd 
situation with the rep. spring.  If I set the hop to a nice positive lift, 
the hammer shank will fall when I trip the jack with my finger.  If I set the 
spring to support the shank after tripping the jack, the hop has a serious 
kick.  This condition is throughout the action.

Any ideas?...