A few worrying things here, firstly these are absolutely new propellers. Inside is a plastic hub compared to the phantom two which is a metal hub. The p3 has a feature which it automatically brakes ( airbrake). No I don't know if you have noticed when you tighten these propellers they usually require a little snug turn. Whereas on the older models it just spun on. It is I think due to it being metal. They have had to design this with plastic because it makes it tighter for the air brakes maybe? What happens when the plastic wears out? Also What is the default setting for air brake strength? What is everybody keeping theirs on?