What a difference a year makes

[Kent]

However, I also see a few fisherpersons who seem to get more white bass than perch, so not sure what they are doing differently? 

The perch are hugging the bottom, so it is easy to not catch them (just keep one's lure a foot or more off of the bottom).  We didn't locate the white bass until the middle of the afternoon.  We marked many schools, but most were unwilling to bite.  Perhaps had we moved to where we found the white bass earlier we may have caught more white bass.