It's correct, i think you check switch and dhcp server

port channel vs port physical need same mode access or trunking

yes, beacause switch working using mac-address, if will learn mac source and forward to destination mac, not care ip address

storm-control multicast level bps {max} {threshold}if = max will action shutdown or rejectif = threshold will drop randomstorm-control multicast level bps 50 3050% 30% 

Please disable feature mesh of Access Point Wi-Fi, if you use unifi Access Point please uncheck feature use mesh or uncheck use wireless for uplink mode globle setting