Well now..... we'll see if that holds up. I dug deeper into the settings on that 5 port switch and found that ports 3,4, and 5 were limited in a different area than the one I had "fixed" the other day. I think I've removed all restrictions on the ports now so we'll see if that holds.
I dropped about 100 Mbps by turning on all of the traffic monitoring and "global threat" settings in the UGS but I'm OK with that amount of overhead.
USG should be able to do pretty close to 940Mbps without any of the IDS/IPS stuff enabled and none of the QoS/Smart Queue enabled either.
Does that switch have any firmware updates available?