Currently have a 1 gig fiber, into a ERL3 router, was going into a

This all goes into our main backhaul links (Rocket M5's) to get to our remote hub site !
We had the problem with the 1 gig to 100 Mbps transition causing 1/2 half download to upload speeds. Only way I could prevent that was to set the ERL LAN port to 100 Mbps "Half Duplex" (a bad work around, I know

If we replace the Netgear with one of your switches (which one), will it fix the dreaded 1 gig to 100 Mbps problem when I turn the ERL3 back to "Auto" on the LAN port?
And how would it be recommended to be configured?
Will be replacing the Rockets with AirFiber X's hopefully within a month!

Thanks,
Wayne