All I know about my timing is at idle with my light I have about13-15btdc. (I will check it again also) that and the fuel pressure sensor.I don't believe you need more than 1 wideband. I have the choice of 1 or 2 and I run 1. You could always get another sensor and just swap the connector or get a second controller as well and run one to a gauge and compare the two but I think you're just gonna drive yourself crazy trying to understand the differences. Should be close enough.
As far as cylinder temp, you sure your timing is good? you also just might need to drive it a little to work everything out. Pretty sure my cylinder temps were a bit whacked at first and I spent too much time overthinking it. Although I also did have a bad ecu at first so don't remember my timeline right now.
He maxed timing at 36deg which for this engine is 5 deg too much, so that will change but I won't have a load on it till next Wed and we will change it then.