Airflow and Pressure for Chip Evacuation

I’m aiming to blast plastic chips from the tool path, wonder what flow and pressure y’all have- or wish you had -for similar tasks. So, how hard do you blow, how much, and what are you using to deliver that?

(I’ve got an ancient Sears compressor- ~20 gallon, 150 psi tank, 1.5hp, claiming 7.3 CFM at 40 PSI- too anemic for running something like a cold gun.)