Update:
We have released v3 of the Nimiq / Argon2d bitstream on the BCU for @Crypt that increases hashrate up to 900Kh/s. All existing device managers that were using the old Nimiq v2 bitstream have been automatically migrated to the Nimiq v3 bitstream. You should see your miner download the new bitstream and start mining once the configuration update has been detected.