Seems good and is good are very different. There are a lot of pipes and couplers in this kit. You've likely blown one off down deep where you can't see it. Since you're making some boost it's likely a leak, not a full pop. look again.
Don't forget to check the BOV sealing as well. A leak at that flange on in the disphragm would give results like this. WG seals, too.
Could also be belt slip. Look for rubber dust around the pulleys.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.38 at 120.85
2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP