The reason you can't copy Excel direct to Romraider is that it expects the top left cell to contain [Table2D]. You can use excel if you offset the top row 1 to the right and add that in. It'll look odd at the 2 rows won't line up but it'll work
Obviously the Copy Romraider option does that for you. See what happens if you do that and then paste to Excel....
You'll never get a log with just CL. There are multiple reasons the ECU switches to OL. Throttle angle, speed and the OL fuel map are all factors. Realistically I doubt you'll get much reliable data above 2.5V.
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solidONE just use the log stats screen if you want to start playing with IAT compensations. I do everything in that tab, including MAF changes. It's quite powerful.