Audi BUH engine install questions

[C6NVS1]

Hi,

The Aquamist wiring diagram for the Audi BUH engine (2008 RS6 V10 TFSI) shows the N75 splice from the black ECU1 60 pin connector at pin 4 (GY/WL).
However, the Audi documentation says the N75 is Pin 50 at ECU1 (GY/WL).
Can you please confirm if I should splice the GY/WL from pin 4 or pin 50?
Is it relevant that the car has 2 x N75 style solenoids, one on each turbo (N75 right bank pin 50 ECU1 and N274 left bank pin 50 ECU2)?

Am I correct in assuming that the reason for the splice is to bypass the N75 and only allow max (mechanical) wastegate boost pressure when the system is switched off?

Also, I am currently running 2 x 1.2mm jets to the intake. What is the MAX jet size I could use, to stay within the system limit of 1500cc, to add 2 x additional jets externally spraying the IC's.

Thanks.