Peer-to-peer gaming less connection than prior router? Port-fowarding?

[railswrack]

I just recently upgraded from a modem+router combination unit to a standalone modem + OPNsense router (minipc) + switch.

Everything is working fine and I'm getting better internet speeds and a stable connection

Though something I've noticed is that on an online peer-to-peer game I usually play (Vindictus) I'm getting less of a connection than before from other players.

For example, I live on the west coast and before with my old router I got a 4/5 bar connection (ping) with players who lived central and east. Now, after switching my modem + router, I'm only getting 3/5 bar connection with the same players.

My OPNsense settings are default settings. I'm not sure exactly what's causing this? After some googling, it looks like it might be port related though I'm not sure.

How exactly would I forward these ports to test if it works? 27000-27025, 36567, and 47611 tcp/udp
I don't know how to do it. Under Firewall>NAT>Port Forward when I add new, what settings would I do? I'm confused how to do it.

Is there another way? Like to add a rule for my WAN network that would open these ports for my network instead of port-forwarding them to a specific device on my LAN? Would that be possible?

Thank you!!