I've noticed two variables that seem to affect this. (I've been using the Omoton glass screen protectors.)
If my hands are really clean and dry, the screen seems to respond less consistently.
If the iPad is sitting on a table, flat, rather than being held in my hands, response also is less consistent.
If my hands are really clean and dry, the screen seems to respond less consistently.
If the iPad is sitting on a table, flat, rather than being held in my hands, response also is less consistent.