Slow read speed on iSCSI

I got my first nas recently and I'm getting quite a lot slower read speeds than write speeds. First I bought a u/utp cable, getting 6 mb/s sequential read but 300-700 write. I connected it with a 1.5m cat6a cable included with the TX401 and got 200 read. Then I bought an S/FTP cable after someone said it might be interference (my ethernet cable is next to the extension cord. Now I get around 200 read but still, 700 write. Separating the cables so they aren't remotely close only gives a small...

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