I do not know with any certainty but I would think that having all devices on the same version of firmware will be helpful.
I am not a capsman guy but to get your RB2011 and 6 APs working, I can provide assistance without capsman to at least get you to a working config.
While you have that, suggest work with ONE hapax2 on the side to get capsman working with the RB2011, and when successful apply to all ??
you will need a management vlan where all smart devices behind the router ( any smart switches or APs) will get their IP address from.
This is a good reference for vlans.........
viewtopic.php?t=143620
The best thing you can do is take one port off the bridge and do your config from there, a safe spot. For both Router and APs.
1. Take ether5 off the bridge at /interface bridge port
2. Make the following additions/mods
/interface ethernet
set [ find default-name=ether5] comment=OffBridge5
/interface list member
add interface=OffBridge5=LAN ( and trusted if you have a management interface list )
/ip address
add address=192.168.77.1/30 interface=OffBridge5 network=192.168.77.0
3. Now you can plug in your laptop to ether5, change your ipv4 settings to 192.168.77.2 and using winbox access the router as per normal.
4. Now you can start configuring your router for vlans such as guest, home, iot, media, anything else, and any other vlans aka printer vlan, or spouses work vlan, or kids vlan etc.. THe idea being you dont want vendor equipment and work and home mixing with anything else,,,,,,,just internet access, etc....