Nice speed! I've only found a couple software firewalls that can push high speed. Norton and Panda. Every other one I have tried has some sort of connection throttling. The only alternative is to use one of those two, or use a product without a firewall (Like Cylance, Forticlient, etc)
I've managed to push my speeds to around 1,100-1,300Mbps with lots of tweaks, network optimizations, CAT6 home runs, and a L3 switch with traffic optimization. Gryphon also has a 'Priority Device' setting which helps push things along even better.