Thanks a lot for the information.
Are you troubleshooting the guest network or an independent network other than the guest?
17 AP's on channel one isn't an issue. What becomes more important is if, standing in one place, you can see multiple AP's on the same channel.
It has become very typical today to over deploy AP's. Too many AP's can be almost worse than not enough. Not enough is easy to troubleshoot; too many becomes more difficult.
I have deployed Wi-Fi in about 50 hotels. I travel quite a lot by my big GT Hill bus (Motor home) and would be happy to come take a look (no charge) if you are along the way. Feel free to email me at gene at my forum handle dot come if you like.