Well. The noise margin seems to be ranging from around 5.3db to 7db throughout the day. Mid to late evening being the worst (as expected really). However the connection's been solid so far, it's not dropped once since I restarted the router 18 hours ago, and I've not noticed any difficulty browsing/downloading files. Testing with WinMTR reports practically no packet loss either.

I'd like to thank everyone who posted here and helped me sort it all out. THANKS!