Good news everyone. I did a sysupgrade using the snapshot from this link. I no longer need to use VLAN 100 to ssh to the switch, and I'm able to ssh after changing the IP to 192.168.1.2! After setting the gateway to my router's IP and setting the DNS IP I was able to opkg update and install LUCI. Hoping that this snapshot is stable enough to use for a while. I will need to do more testing.
I'm guessing that the image I downloaded from the firmware-selector site is buggy. I even double checked the sha256sum of kernel.bin and sysupgrade.bin after transferring the file to /tmp. I'll report this in the firmware-selector thread.