Here's the exact combination I used, try it and you'll probably get a perfect game:
Lady with the 7 lbs ball (to be sure, name it "gui", maybe it plays in randomness, but I doubt.)

I'm only using two kind of throws.

Shot 1 = Place the player on the right side of the lane, exactly at the left of the second dot from the right. Perform a maximum curve to the left, and get maximum power.
If your power gauge is 1 away of the maximum, you'll still get a strike.
A less curvy shot will work too, but not a light curve.

Shot 2: Place the player on the left side of the lane, exactly on the third dot from the left. You should have the dot directly over your player.
Perform a very light curve to the right, and get maximum power.
1 away of max power will work as well.

Frame 1 = Shot 1
Frame 2 = Shot 1
Frame 3 = Shot 1
Frame 4 = Shot 2
Frame 5 = Shot 2
Frame 6 = Shot 2
Frame 7 = Shot 2
Frame 8 = Shot 1
Frame 9 = Shot 2
Frame 10 a = Shot 2
Frame 10 b = Shot 1
Frame 10 c = Shot 2

If you do it like I said, you'll get a perfect game every time, on lane 1.

Cool thx for posting the exact sequence, I'll give it a try

^^Agreed. Thanks for posting this, guill.

My pleasure guys.
I wanted to share it, but I could not reveal this before the end of the contest

I gave it a try this afternoon, and it worked like a charm.  I had been trying from only spot 1 with lots of curve and max power throughout the contest with the blonde guy with an 11 lb. ball and had a fair amount of success, but just couldn't get a perfect game.

Yes, it worked for me too with minor modifications.
The formula worked beautifully the first 6 frames. Once I got to the 7th frame I had to break from guill's sequence... shot 2 just wasn't working, and I was using an emulator so I kept doing it over using save states to confirm. However, I tweaked the sequence successfully to get a perfect game. I used 111,222,122,211. Maybe it's because I put in initials AAA? Otherwise all other conditions the same. Thanks guill, and btw nice job cracking the secret to this game!

I used initials AAA and had no problems. Although, on frame 8, I put too much curve on the ball, but still got the strike. Guess I got lucky. Looks like you found a sequence that works as well, Ace. Nice job.