What's the model number of the AC750? The AC750 is the wireless parameters of that device.

Not sure what you really need. But to use both of them, we can either put one as access point, and disable DHCP on it, or use both as router, and leave DHCP enabled on both. On the second method, the...

hi jvreeker, is your router TL-MR6400 or MR200? and it is v1 or v2?

can you show us those firewall rules screenshot that you have setup on this router? and do you mean access control? and it is your TL-MR3420 V1 or V2?

the M7350 supports power save mode so the screen will turn off in some minutes.

change the channel width to 40mhz and try different channel like 1 or 6. also try some suggestion mentioned in this link. http://www.tp-link.co.za/faq-468.html