Hi, I'm a bit confused about what's going on with my idle. Pictures tell the story...

Closed loop screenshot
Open loop screenshot

Closed loop, the NBs are pulling fuel out via the STFTs and making me go lean. Is this normal? The idle gets increasingly unsettled as it leans out. Also, what's causing the STFTs to suddenly jump back to zero?

Open loop, do my NBO2s look healthy? Seems odd bank to bank...or more likely am I down a spark plug/injector? I'm also not sure why it's progressively leaning out, ECT and IAT are almost constant.

Here's the spec:

LS1 with LS2 heads
222-226/115+3 .6"/.6" cam
102mm TB / FAST
Full exhaust, OTRCAI
LS3 injectors

I have just upgraded from COS2 to COS3, thinking I should try open loop around idle, although it doesn't seem to have taken (the closed loop shot is in fact using COS3, with .98-.99 lambda commanded below 1200rpm). I'll do more reading there, but is this a good strategy in general?

Files:
Open loop tune / log
Closed loop tune / log

Any help much appreciated - I read a lot, but don't get much time to try things out...so sanity checks/pointed advice where to look would be great.