The ramps are definitely difficult to hit more often than not in my opinion. I've got mine at 6.5 pitch based on the manual. I haven't really adjusted the levelers at all, but I'm probably going to begin experimenting a bit. I think it's difficult and challenging enough and can't imagine it getting any easier if I make it even steeper.
I love the game but it can be extremely frustrating...
A common thing I'm experiencing in my first month of ownership is too many drains down the left and right outlane and closing the gap all the way doesn't help either. The ball just flows so perfectly down the sides, probably more than it should. For example, I had an awesome ball 1 yesterday, around 10,000,000+ and then the next ball basically went down the left outlane and ball 3 went down the right - lost them both with less than 400,000 points total between ball 2 and 3.
After that I took a round on my punching bag. I don't usually get angered but that was pretty frustrating. Thought I was well on my way to a 20,000,000 game which definitely doesn't happen often at all. I think I only hit that many points on this one maybe 2-3 times now.