MAF voltages at idle?

So i have a factory FSM for my car, but it doesn't list operating specs at idle or 2k rpms, etc for MAF. My car fails smog due to high HC and sometimes CO (HC is 600-800, CO is 0-1.2%). I was able to get my car registered due to a waiver, but registration is coming up again in a couple months. And so far i've only been able to fix my idle issue, but i've still got a fuel mixture gremlin.

What has been fixed/adjusted so far:

15* BTDC timing
Adjusted idle at IACV
New air regulator
New CHTS w/ connector (nissan)
New fuel filter, plugs/wires/cap/rotor (all nissan parts)
fuel pressure 34 at idle, 42 unplugged
Has an aftermarket catalyst
Vacuum is 22" at idle

I think i have a sticking lifter on cold start in warm weather (its noisy, and vacuum stumbles on start-up until the lifter isn't noisy). After 5 seconds or so though, i have good vacuum. I've sprayed for intake leaks, and cannot find any. I'm suspecting maybe a leaky or plugged injector, or a "lean" miss, but i'm not sure.

Anyway, onto my question, was just giving you a little backstory on what i'm diagnosing.

I was checking my O2 voltages today, and fully warmed up after a drive and letting it idle, my O2 sensor was jumping from .04v to 1.22v, it didn't really sit long in the lower voltages indicating consistently running rich, but it would spike out to 1.1-1.2v, generally meaning lean, which seems alittle odd to me. Normally O2 sensors don't go above 1v very often, but this is a titania sensor i believe, so i don't know if its got a bit more tolerance. So i'm wondering if i have a bad sensor, or if i have an exhaust leak (i think i have a small one around the driverside manifold). I unplugged the O2 with the engine running, and it actually seemed to run a bit smoother, then i restarted the engine it started running like crap. So i reconnected the sensor, no change. Did a battery reset, and was still kinda rough but smoothed out shortly after.

Anyway, i then checked MAF voltage at the ECM, and it shows 2.5v fairly steadily. Problem is, i don't know if thats normal or not, since the FSM doesn't list it, just 0-12v or something like that. I mean, other MAF's i've tested show voltage from .99-1.4v at idle. But those are fairly modern MAFs from the past 3-5 years. So, does anyone know what their car's MAF voltage is sitting at idle?

Also, this comes more as a suggestion that anything, but perhaps we could make a chart/post of known good sensor readings/voltages on various years for diagnostic purposes? Mainly involving those still using the factory ECM. If you don't have emissions/idle components installed, maybe just state you don't for comparison.