1 tip is if you hold L1 and use the up and down arrows you can scroll through the enemy list

As for strafing while locked on, I do not know if there is a way to fix that, but there isnt really any reason to lock onto an enemy in the first place, and it can actually be a detriment in some cases. It is not like Dissidia where they will be going all over the place. It is really better for you to get used to manually controlling the camera (zoom in and out is L1+right stick up or down btw). If you insist on using lock on though I dont know if I can really help