Not going to roll out if the oil is heavy enough. There just isn't enough time for the ball to grab and use all of it's energy in those last so few feet. If the pattern is long, the ball won't make a huge move left/sideways, the key is to get the ball rolling early enough and have it finish solid through the pin deck.
With your slightly lower track, don't think this will be any problem at all. If you are really worried about the roll out, go to 4 inches with the pin and use slightly more surface.
You should be fine with your original idea though, adjust surface to taste.
--------------------
THIS SPACE FOR RENT