Hi,
Bielec, twisted wires as small capacitors… that’s a very neat trick (also an old school one 
). Good work!!!
My question (as you are very handy with hw) is whether using small valued resistors could avoid the use of the three compensation capacitors… (as in U17). Other thing is if you have 0603 resistors of proper values…
Unrelated, ADC decoupling is not bad (22uF+1uF), but for high frequency (>3 MHz) one expect also a smaller capacitor (10nF) which would provide the fast transient current for conversion peaks.