This may help! https://documentation.meraki.com/MR/WiFi_Basics_and_Best_Practices/Wireless_fundamentals%3A_Signal-to-Noise_Ratio_(SNR)__and_wireless_signal_strength About if the avg latency is normal, it depends on your LAN solution, but the transmit power as you say, affects it. You can also check about channels utilization on the RF spectrum. https://documentation.meraki.com/MR/WiFi_Basics_and_Best_Practices/Channel_Planning_Best_Practices PD. Sorry for my english, i wish i could help more..
... View more