The technology that cable internet uses is a very dark art indeed, and "low" power of itself may not be a problem in some instances. What concerns me in your hub stats are that this occurs along with high error counts and highish upstream power. Could you reboot your hub, give it a good few hours (or overnight) and then re-post the lot again?
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I think a tech needs to be called out to try things such as removal of the booster and moving the cable onto a lower tap point. Once we see the effect on signal levels and Post RS Errors we might be in a better position to figure out what (if anything) needs to be done.
I've had a big 'ole nosey at your networks and can't find anything out of spec. I can confirm that everything is well within range and there are no utlisation issues either. I've tried to look at your WiFi details but I'm unable to. It may be the tool going weird at the moment but can you check that your WiFi is on so I can take a look at the complete picture?
Aside from the stats on your Hub, can you describe how it's affecting your internet usage?