Couple more pigeons after work. DRT.
I found that once the air gets a bit below that 50% line accuracy drops off. But that's still quite a few shots before needing to recharge and the compactness of this thing is invaluable.
I think you'll have better luck if you keep it operating between 2000 and 3000 psi.
When it hits 2000, it's not much work to bring it back to 3000.