Hi stiv, XDEV in the version as you used it needs constant tuning. That is probably the reason for it's "mediocre" performance. If you would optimize XDEV for each 100 day cycle in that 5 year period, it should do much better.
About the "all or nothing" approach, I am not sure. I have played with the idea myself, but have come to no real conclusion. I guess I need to do a simulation on that myself to find out just what the advances and drawbacks might be.
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