Funny you should mention that because I've noticed that mine is doing the same and suffering the same symptoms. I'm trying to get mine booked into Power engineering to get it setup because for some reason with the standard actuator or a -31 my car is producing too much boost and spiking I've also changed the plugs, leads, dizzy cap and rotor arm thinking they would cure it but it looks like it's down to boost spike because once that comes back down it clears and the car flys

My standard actuator has nearly no pre-load at all on it though Is that likely to cause this boost spike problem? I've been considering adding half a hole of pre-load to the standard actuator and seeing how it performs.