Where are you getting the ball hop?
Off the flippers? Off the slingshots? Of a specific post or area of the playfield?
I'm not sure about SBM, but I know on many Bally's of that era... if you put round rubbers on mini-posts, instead of "T" rubber, you'll get a lot of hops off those posts.
WRONG RUBBER:
https://www.pinballlife.com/716-od-white-mini-post-rubbers.html
CORRECT:
https://www.pinballlife.com/white-t-post-rubber.html