No, Ruckus equipment is as good as Cisco Meraki.
I've had clients who followed this same logic and it didn't solve the problem. Adding more APs also doesn't mean it will improve your network, in fact in some cases it could even make it worse.
I believe you need to redo your entire network design, maybe relocate some APs. One idea is also to use directional antennas in some specific locations.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.