Thanks for using the forums to get this issue with your WIFI looked into, I am sorry if this has been causing some frustration. I would be more than happy to look into this for you.
WIFI signal can be tricky to get perfect, WIFI pods do help in instances where the WIFI needs to be spread more evenly throughout a home. However, I completely understand why you'd rather not pay more a month for them.
There are other tips and tricks you can try, first one being rebooting your Hub once every 2 weeks so that the data within the Hub can refresh. I have checked your services on my side and can see it's been nearly 3 months since your last reboot - So I would highly recommend turning your Hub off at the back, giving it a minute of downtime and switch it back on.
After you've done the reboot I would then move onto using the Connect App to do a WIFI scan of your home, this will detects any issues and suggest any fixes that would help.
Next would be to see if any of your WIFI connected devices could actually be connected via ethernet cable. Things like gaming consoles, TV boxes, PC's etc can all be big draws on your WIFI channels, which could be causing congestion over your WIFI signal.
Please let us know how you get on!