Bars are a joke. Some manufactures set the bars to be full at very low dBm levels. Hence why some phone have "GREAT" wifi coverage and some need "help". lol Get Wifi Analyzer from the play store. Load it up on both devices. See how the dBm levels differ from the same spot. If the N7 has more dBm's then the N5 than you have conclusive proof to back your complaint. Should take all of three minutes to to some testing. Let us know the results.