You're mixing the 3 styles of configuring VLANs (1. VLAN-aware bridge; 2. VLAN-aware bridge; 3. VLAN interfaces on physical interfaces with bridges per VLAN) while you should be only using one ... and that's VLAN-aware bridge.
cAP ac can't offload bridge VLAN operations to switch chip, but it's mostly a non-issue in this case because wifi operations don't benefit of that (at all), it's only got 2 ether ports (which benefit of that) and has decent CPU which can handle the load.
So go with method described in this tutorial, there's post with explanation of config for APs.