How lean is too lean?
What did you use to develop that log?
Innovate's LM1 wideband logger with their Auxillery box.
The aux box has a RPM channel, MAP sensor, and forward/back and a side to side accelerometers built in.
RPM in my case I tapped into the tach wire from the MSD 6T. But any frequency source can be used.
For MAP I have a tee into the vacuum gage line and then use a flexible hard vacuum line through a firewall grommet to the unit which sits on the passenger floor.
Throttle position sensor can be wired to it. It's on my to do list, just not been a priority.
The software is Innovate's Logworks which can be downloaded for free. It's pretty good once you figure it out.