I’ve never had much success with cooking those particular vegetables in the IP even on steam for 0 minutes, they come out too soft. Generally speaking, baby carrots or chunks of larger carrots take longer to cook than broccoli and cauliflower. For instance, when I cook on the stovetop I add the carrots to 1/2” of boiling water, let them cook on their own for 1 minute then add the broccoli and cook another 3 minutes. I’m basically steaming the broccoli in that small amount of water over the carrots. I haven’t been able to come close to our preferred al dente veg in the IP. All I can suggest is hit the Cancel button the moment the pin comes up indicating it is up to pressure and quick release (because the veg will continue to cook when pressure is being released).
It is frustrating wasting veg experimenting.