Man, I think I'm pretty decent at this game and it still kicks my ass regularly. I have yet to reach eternal life. I've completed 11 of 12 modes about three times but have never managed all 12... and I can hit the mode saucer all day long... about 75% from the left and maybe 50% from the right flipper. Maybe I just enjoy playing the modes so much that Im never in a rush to complete hem all.
To date, my best showing is 933 million and change. I was just a few seconds away from my first billion ever
I don't play it religiously but I can usually get in the 500-700 million range pretty regularly. As TheLaw pointed out, IJ is not a super fast machine. I plan to CC my PF very soon and this may change things a bit.
As for PoA. I wrestled with mine for a couple of years. I swapped motors, tried different flipper optos, I even thought it was a mechanical issue and looked for obstructions. It would move well in one direction and jerky in the other. Then I finally installed a new PoA opto board (the one mounted to the back panel under the PoA) and it is now super responsive!