LTC4162 Battery Charger Design

[bbqstingray]

Hi all, 

Could you guys take the time to critique my LTC4162 Design. 
I have going to hook it up to a 7S1P LiFePO4 battery pack that will output ~22.4V.
I plan to connect the output to a step-down regulator LM5118 at 12V.   

I am unsure if its best to have a 4 layer board or 2 layer board for this application. 

Thank you for taking to time to look at my post. 

Datasheets:
LTC4162
https://au.mouser.com/datasheet/2/609/LTC4162_F-1371182.pdf
https://www.analog.com/media/en/dsp-documentation/evaluation-kit-manuals/DC2038A.pdf

Inductor:
https://au.mouser.com/datasheet/2/597/xal60xx-270658.pdf

MOSFET
CSD19534Q5A
http://www.ti.com/lit/gpn/csd19534q5a

Schematic


PCB Layout