My truck is a 2012 with 35k on it, and I just installed the Edge CTS touch screen tuner and what a difference this thing makes. Now when running maybe half throttle, I can hear the BOV before the transmission shifts. It dumps boost at about 2400-2700k rpm, and then it picks it right back up. It this a wastegate issue and need to upgrade the spring or what's the deal? I think if this issue is corrected the power band would be more smooth.