So I checked my signal strength, it was at 100% with 12mbs download 2.8mbs upload, I've read that connection isn't all about signal strength and that telephones, microwaves, etc. can sometimes interfere with the signal, but I was wondering would I get better connection with a powerline adapter?
Try using an ethernet cable wired connections is sometimes better than wireless.
and does your internet have any security? for example WEP/WPA? if not set one up people can be connectiong to your wifi without you knowing and can possibly interfere with your online.