Your easiest solution is to separate the 2.4 and 5 GHz bands. This gives the hub two separate SSIDs, one with the original SSID and the second with the same SSID except it will have -5 added to the name. Both use the same password, see https://community.plus.net/t5/My-Router/2-4ghz-and-or-5ghz-best-practice/m-p/1351966#M840. Use whichever works best for your other devices.
Note that the second generation Chromcasts work on both bands bur probably doesn't like the two synchronised.
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