So last week i got tuned by a very reputable and safe tuner. My car was driving great, making 420+, 13.9 lbs on an AEM solenoid, AEM v2. Last monday however while making a pull i hit the limiter a couple of times. Next time i tried to pull it cut off at 6k rpm. I looked under the hood and saw a huge boost leak, fixed that and now its spooling faster and cutting at albs around 4k when i spool. what could be the problem

 

sounds like your hitting boost cut on the aem. What is your boost cut set at?