Mine was 4 for a long time. Then 2 nights ago I hit 5. I almost pissed my pants as I hit the 5th time. It was going so fast that it came around for a try at 6 and it was a laser drain. I missed the ball with the upper and lower flipper.
I've only gotten 5 on HS2. I make it to the top of the loop more often than not but it ends up hitting that corner by the entry to the lock ramp and falling into the bumpers. Does having the upper flipper adjusted a certain way help? I installed using the toothpick method and the ball tends to skim the upper flipper coming around that left orbit. I wish it would count right orbit loops because those are really fun to make!