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Have you checked in the settings - Hub's config file - that the upgrade has actually been sent to your Hub?
Also as you are already in modem mode, can you boot up your (Windows?) device into "safe mode with networking" (to disable any software on it that could be limiting speeds - lots do!). Also run your speedtests at speedtest.net (do them on x2 close VM servers) try using 2 different browsers - preferably with one of which is a fresh download of one you haven’t previously used (e.g. Firefox, Opera, Safari etc) - there are several reports on here of certain browsers causing speed issues.
See if they are still low then (at a quiet time).
-------------------- John --------------------
My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.