@uptownVagrant
many thanks for your help!!
I imported your config on my firewall and played around with it a bit. Sadly I didn`t get any more performance in relation to the stuck traffic at about 500 mbit/s I had before.
The PC I´m testing with has 1 Gbit onboard lan and two 1 Gbit Intel nics. The two Intel ones are the nics I´ve been using the whole time. After testing with your config I desided to switch the "LAN" port from the Intel nic to the onboard nic.
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After changing this I could get full 1 Gbit/s (110 Mb/s) copy speed through the firewall-bridge, at least in one direction.
The other direction still makes only about 60Mb/s, probably because of the Intel nic on the WAN port.
So in my opinion, I struggled the whole time with some incompatible ore crappy network cards in my specific hardware constellation, which caused my traffic bottleneck through the bridge...
In principle, my configuration was correct the whole time, unfortunately it was not the hardware...