I have 15411's and would not want any more oomph..mine EASILY make the ramps..and with fast fast speed. If I had any more I'd be afraid of breaking targets and plastics. My fastest flipper machine that I own...adjusted well and highly polished playfield makes this game kick ass...fast fast fast
would I want weaker...No..never hurt any thing yet,
Absolute blast to play! I catch myself swearing in surprise how quick things happen in this game even to this day. Great reflex machine...I just love it!
EDIT:
btw mine = factory 15411