Hmm, my issue is since having hybrids fitted, I've had new actuators too. I think they must be a bit stiffer than the originals, as I'm not seeing full boost in 1st gear. All the other gears are fine. I don't get the second turbo rush until about 5500rpm in 1st, though occasionally, I don't get it at all.
The way the boost controller plumbs in, IIRC, is that one of the actuators is blocked off one end, with the controller plumbed into the turbo and the other end of the actuator (where the AEM manual would say plumb to the wastegate). If this actuator is running off a pressure level as the spring would, my thought process is that adjusting the spring pressure on the controller would have the same effect......or am I way off?