If your knock increases then typically that means you dont have sufficient octane or timing in the chip is too high. The timing is adjustable on his chips, you may try reducing it. Look at the instructions included with it.
Boost is open loop on our cars. Meaning the computer doesnt know how much boost the engine runs. It does regulate boost through the boost solenoid. If you have an adjustable wastegate, simply shortening the rod will increase boost. If our wastegate is non adjustable, then boost cannot be changed.
More than likely if the thrasher chip pulsed the WG solenoid less and the car was at higher boost.. it would feel prepier. Same with the timing.
So if you can, shorten the wastegate rod, and drop timing in the chip. And make sure there is plenty of octane available.
Lastly, 138 on BLM means the car is a little on the lean side. Meaning the ecm is adding fuel. I dont know if this contributes to the knock you are seeing. Typical cuases of higher blm's are low fuel pressure or vacuum leaks.