UPDATE
SOLVED: As strange it may sound I read around and one user suggested disabling windows defender's anti-malware. I was very weary on doing this, for obvious reasons. But I got to thinking, hey... if it did not work, i could just turn it back on. Well after changing the setting, and rebooting the laptop, I performed another iperf3 test. It's not the full 433+mbps, but I have walls between me and my router. It works!