AP410C, dual 5GHz config, but majority of clients connected to Wifi1

[w1f1n00b]

We recently deployed two AP410C access points to an area with high client counts.
Checking on them this morning, both APs have almost all clients connected to wifi1 with little to no clients on wifi0

In an effort to keep my configs as simple as possible I've avoided using any load balancing settings thus far.

Without having the "radio load balancing" setting on in the radio profile, does the AP make any efforts to distribute clients between it's two 5GHz radios, or is it purely up to the client driver to make that choice?

[w1f1n00b]

To add to this, since I'm impatient, I went ahead and changed to a radio profile with radio load balancing enabled, and I'm seeing a few more clients on the wifi0 radio, but it's still about 75%+ on wifi1. Would love to hear if anyone else has had similar issues.