Quoted from jrebs:
I'll investigate the jumping issue. My phone is a potato, but I have wondered if the ramp entry was maybe a little too steep initially anyway, so if I make some adjustment to smooth out the ramp entry it shouldn't hurt even if it doesn't solve it.
IME this is usually what happens on ramps that have the gates up them - people see that spring steel at the entrance and they torque it down as much as they can, this causes airballs. It's supposed to be tweaked down 'just enough' so there's a smooth transition from the playfield to the ramp. Some games have foam underneath to help cushion the the flap. Extremely common when people replace ramps for this to happen, or just shopping out the machine and being misinformed as to how the ramp transition is supposed to be.