LM3886 p2p - ground issue

[Stabist]

Hi!

Finnaly got some time to finish my interpretation of Patek GC - using LM3886TF - non-inverted version.

So I have few Q just to make sure I'm in the right path:
- pot will be/is external passive pre - with 50k log
- so I guess I have to add 22k resistor at the input from (+) to GND

- is this grounding I intend to do OK:
--- all power grounds connected together at speaker (-) out
--- all signal grounds connected together at RCA's ground
--- both of them connected with thin wire
BTW - where should I connect pin 7 that goes directly to GND - to power or signal?

PSU is in separate chassis - unfortunately not dual mono - but chips in Patek chassis will be in "dual mono" layout ... (the cable from PSU to Patek will have "doubled" wires - so it will be separate for each channel - but as said - at PSU connected together to same pins ...

Thanks for tips and help!