Thank you!
To answer your questions:
The shower setting allows more water to travel down the vehicle, thus allowing it to lift the soapy water more effectively! The higher pressure can scatter it around, so less pressure is better for rinsing suds.
I use foam guns with concentrated solutions often, and find it effective. However, it was not used on this Ferrari due to the amount of openings on the vehicle. Example being, the entire engine area is exposed with mesh grills, don't want heavy concetrated suds filling in the vents and grilles.
I personally always read a vehicle I haven't performed any work on before to create a baseline, more of a force of habit. With that said, should you ever need to compound or heavily correct a vehicle - it is imperitive to use a gauge. Lighter polishing doesnt necessarily require it, but its always safe to do so!
