First thing - can you use Mbps data rather than MB/s.... as 1.3MB/s = 10.4Mbps and those are the units we prefer to use.
I have just replied to a similar message - can you do as I said in message 2 here...
https://community.virginmedia.com/t5/Speed/Broadband-speed/td-p/5024231
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.