Your new front mount intercooler might be costing you 15-20 whp. The pressure drop characteristics changed, but your ECU is still mapping for the stock system.
Your new front-mount intercooler is working perfectly, dropping intake temps 8-11°C below your old setup. The problem is your ECU is still running a tune calibrated for warmer, less dense air.
Most swappers focus on power gains while ignoring weight distribution. A 50kg difference between engines creates cascading effects on suspension geometry, brake bias, and ECU calibration that show up in your datalogs.