Hi @riffy and @Spunky03,
Your experiences with chromecast & Tablo are different from mine. I use chromecast to view recorded tablo content frequently. It is not always perfect, but good enough to let me enjoy shows on a living room and bedroom tv. I do not use tablo for viewing live tv.
My configuration is;
Tablo 4 tuner (wired to router)
Netgear R7000 router
verrsion 1 and 2 chromecasts. (currently wired, but I have used equally successfully wifi.)
I record at SD quality 480 2mbs. Good enough quality for me and I store lots of stuff on my HDD.
USB3.0 HDD with its own power supply.
Nexus 7 tablets (2012 & 2013) versions with android 4.4 and 5
A note on SD 480 at 2mbs - Several stations I record from are only broadcast in 480 so higher resolutions are wasted in my viewing scenario. I have also found that for wifi less data is better, particularly in busy electronic environments. If you can cast from your phone to chromecast, I would think you should be able to get the app working because your using most of the same pieces.