What prompted me to build my compressor was the inability for either of my other small units to properly run any tool other than a stapler. Many of the specifications thrown around seem fantasy at best, I hope you are pleasantly surprised by your Kobalt. An impact gun does not work optimally at 90 psi btw, they need 125-150 psi in order to produce the combination of torque and hammering action to be effective. There is no small compressor anywhere at any price capable of doing this IMHO.
If I was to do my compressor build again, I would raise it higher and add an electric / remote water drain valve, and install it in my shed instead of in the garage. It is quieter than the old setup however, and doesn't run that often, now that I have the blow off valve adjusted to 140 psi.
Everything is piped in 1/2" iron, with water drains and multiple take offs and ball valves prior to the 6 outlets into the various hoses.
a 16 year old hooligan stuck in a 55 year old's carcass