We had this problem when the CNC was new at work, much bigger compressor but machine was almost picking up then dropping heads at the tool change, turns out it was in routines where the swap was quick, like head one for head 2. Its a 10 head tool change so if it had to travel further it didn't do it. Solution was simply to increase the lag between tool changes a few seconds, problem solved at the programming end. Certainly no harm in upgrading your air system to high flow components, make sure you have a good air dryer in line and that its a high flow device as well as the regulator, those should all have the specs listed if they are decent quality. You can power it with a 30CFM screw jack bit if the regulator it passes through is only capable of allowing 8cfm...you will get 8cfm. Kind of like getting a 4000CFM dust collector to pull a 4" hose.....
"A good miter set up is like yoga pants: it makes everyone's butts look good." Prashun Patel