You are not going to forward directly to 192.168.0.22 from the cisco. You have double NAT, so you are going to have to make sure you adjust for that.
So, create a VIP on WAN and set it to 10.0.0.22.
In the port forward rule, source and source port is any.
Destination IP is going to be the VIP (10.0.0.22). DPORT will be 8800.
Then you set the NAT ip to 192.168.0.22 on port 8800.
I am not sure how you have a gateway with a port. LAN does not usually have a gateway set at all in pfSense. But for your LAN PCs, 192.168.0.2 is a good gateway so long as the PC at that address has a default gateway of 192.168.0.1. Since that just looks like a proxy, and not even a transparent one, I would set the gateway of all the machines except pfSense (which will only have a gateway on WAN address) to 192.168.0.1 and use browser configs to set the proper proxy address.