I've got a 2007 LMM Duramax with an exhaust and a mild tune -I've turned off the tq reduction request option in the trans tune which made it shift much better HOWEVER, monitoring "driver demanded torque" and "torque delivered to trans" still shows a reduction of 50-60 ft/lbs in delivered torque when it makes a shift.... you can clearly feel it and it's annoying as hell. Is there any way to eliminate this?