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If you use non-fixed, it will choose parameter sets that favor the earlier portion of the test and aren't bad in the later portion. That's why you must optimize on part and test on a different part (year.) Set could be terrible on another year.
If you use fixed, it will choose parameter sets that favor the best average performance over the entire portion.
I wrote the multi-pass optimization so I could find get a parameter set that was positive each year over multiple years.