I use a Dava because I have problems with picks slipping in my hand and the grip helps with that. How do your other picks compare on that issue?
Also, I'm always looking for ways to reduce the chirping sound from the pick when picking a note. Do any of your picks help especially with that?
I solved that slipping issue by not squeezing the pick much (specially on fast runs) I feel its edge move/vibrate as I pick but somehow it stays in place, sort of letting its weight or hardness control the force (thats why most are thick+pointy).
But if this does not help you, nylon based picks seem to get a bit more sticky when the fingers start to moist/sweat (like the blue NYL PRO and the red next to it Eric Johnson picks are harder but made of nylon). The clayton also seems to be nice for that but I haven't spent enough time with it.
As for the chirping sound, nothing solves that better than the small HIO pick (dunlop speed pick). I guess the curved tip helps that issue but again you shouldn't squeeze it much as its small, soft-ish and can slip easily. Took me a while to get used to but worth it.