I have just added the 630 upgrade to my CTS-V 2011 and am experiencing some sluggish performance at 1500-300 rpm only when engine is cold. Seems to be below 160 degrees. I had it Dyno tuned and retuned. The second tune some adjustments were made to the 02 sensor maps? Any ideas or suggestions. Has anyone heard of similar issue? Should closed loop tuning need to be done or cold engine tuning? Im going for round 3 on the Dyno.