I have two AP330 within 20 feet of each other with about 70 clients. Most clients tend to connect to only one AP rather than even connectivity between the two APs. What's the procedure for load balancing between two Aps?
The two APs in question here would need a radio profile that has load balancing turned on.
Under configuration, expand the left Nav window. Toward the bottom is Radio Profiles. From within a radio profile, under Optimizing Management Traffic Settings, you can enable/disable and customize how load balancing works.
Be careful, as I recommend against enabling load balancing site wide. I'd clone your existing radio profile and just enable load balancing and assign this new profile to these two APs.