I know this is late but did you ever get around issue #2?
Quoted from grandy:Finally finished rebuilding my Big Guns (complete overhaul). It's fantastic, but i have a few questions for the club about things that need tweaking.
1. Balls come insanely fast out of the cannon wireforms. Many times they come down and bounce right over the flippers and into the trough. Anyone have advice about this, or is this just the way it is?
2. bonus 5x light is always flashing no matter what. I've never had this kind of issue, wondering how to troubleshoot and diagnose. bonus lights normally as it grows, just 5x is always flashing.
3. Occasionally it seems like a ball gets promoted into the shooter lane when it shouldn't be, so i'll have 2 balls in play for awhile and when one is lost the turn ends (even thought one more is alive). What are all the valid conditions that would promote a ball into the shooter lane?
4. Rom version - looks like newest is version 8 and i'm on 4. is it worth getting these up to date? I've never done that before.
5. @chitownpinball, do you have any documentation about how you LED'd the backbox? I might like to emulate what you've done.
6. Any general strategy/tips are welcome. I'm sucking at this game, losing a shit ton of balls down the right outlane (i gotta work on my nudging).
7. "you are invincible" insert - mine never lights, when SHOULD it?
Thanks in advance!