you could lower the bitrate but that would impact your recordings.. it hurting your wifi is a sign that it is adequate IMHO hehe
sounds like its time to upgrade your WiFi network, Ubiquiti has some very nice and very fast dual band PoE (24v passive sadly) 802.11ac access points for a hell of a price.. I put 3 of em inside my 1500sqft split level house, all on low power and in central areas and now I cant find any place inside that I cant get 100Mbit wireless speeds on 2.4G and many times that for 5G
but still, id never expect to have live video w/out ever buffering on WiFi.. just too many factors can make it great right now, and shit in a few moments from now.. there is a reason why every streaming TV device in my house is hardwired ethernet.. its sooo worth it, videos start the moment you click them in full resolution glory and it never has to stop for nothing.. my big expensive high speed wireless network transmits practically no realtime video streams, and thats why its so fast..
in my professional opinion, HD Streaming Video on WiFi can also be referred to as WiFi Jamming.. just get a few going in close proximity at once and watch the spectrums just crumble.
the key to a good wifi network is not one big powerful access point, its multiple distributed low power ones.. this way wireless clients can roam properly and maintain line of sight for those really great speeds and connections... poe really helps because you can put em on ceilings or walls where they can cover the most area with the least obstacles.. my phone's battery life improved almost double when I put an access point in my office above my desk, now it maintains connection all day at minimal power.