I live in Switzerland south of Germany - in Europe we are about 6,7,8,9 hours ahead of You --- it is like some kind of a "time gap" in our talking.
Thanks for post-10. I do not like the feature "every new ball starts with one bonus given" - it makes the pin more complicated. You mentioned a very important fact - ALSO at start-up, resetting and then kicking out the very first ball: This mentioned feature does NOT work correct.
My goal is to get to this "giving the very first ball and the feature works" --- then chances are big that we have fixed also the problem with stepping to ball-2, -3 etc.
My Space Mission also has this (not loved by me) feature "always one bonus given" --- I had a look --- we do NOT need the ball in the Outhole betweeen the flipperbats when we inspect / work on the problem "very first ball kicked out and one bonus given" --- Williams calls the kicker: "Ball Release Coil" and it kicks when we NOT have the ball in the Outhole.
Toggle-off the pin (Safety Reasons) - take the ball out - lift the playfield and secure it - manually put 7 or 8 bonus on the Bonus-Unit (Williams calls it Advance-Unit so I will use the word Advance-Unit) - toggle-on the pin - nothing happens. Start a new game and look at the playfield --- Bonus-Lights equals Advance-Unit-Lights - and also look at the Outhole between the flipperbats --- the following does happen in a fully running Star Pool.
You hear the Score-Motor run - rhythmically the Bonus is stepped down - a slight hesitation - the Advance Unit steps up to one bonus and immediately afterwards the Kicker (Ball Release Coil) fires ONCE then the Motor stops running.
Toggle-off the pin again - manually put 7 or 8 bonus on the Advance-Unit. Start a new game and this time look at steppers and relays --- in detail happens (also see the JPG):
"encircled red" stuff - the Advance-Unit is not in Position-Zero - the Reset-Relay pulls-in and stays steady pulling, this makes the Bonus-Relay pull-in and it stays steady pulling (by its marked rosa / pink switch) - the motor is made running and so rhythmically closes its switch IMP-5B - (through closed switch on pulling Bonus-Relay) the Advance-Unit-Reset-Coil fires (toc, toc toc ...) --- the Advance-Unit steps down and reaches Position-Zero - the "encircled red Switch on Advance-Unit" opens and so the Bonus-Relay quits pulling.
"encircled green" stuff - the Advance Unit steps down and reaches Position-Zero - the threebladed Make-and-Brake-Switch moves , the Bonus-Relay does not pull anymore - the "encircled green Switch on Bonus-Relay" is therefore closed --- The Outhole-Relay does pull-in (and establishes "lemon-green" Self-Hold-Current) - Outhole-Relay stays pulling.
"encircled brown" stuff - the motor is running , switches on Outhole-Relay are closed / moved - Motor-Switches-Long-Dwell-2A and -2B make the Drop-Down-Targets reset, Motor-Switch-3A makes the Advance-Unit step up to one bonus and Motor-Switch-4A makes the Kicker / Ball-Release actuate - the very first ball is kicked over to the Shooter Alley.
Then the Outhole-Relay quits pulling and the Motor stops.
Please check the description (written above) and Your pin's doing --- do You see some strange thing happening ? Greetings Rolf