May chase trip to Tornado Alley?

I've been thinking...and that can be dangerous, but this time it has to do with another chase trip to the Plains. Since our prior family chase trips have generally proved "close but no cigar", I have analyzed them and concluded the following:

a. We have only chased out west during even-numbered years.
b. We have never chased over Memorial Day weekend.
c. We need to chase at least 8-10 days to provide enough potential to catch some good action.

Per the graphic above (excerpted from SPC storm reports over the past nine years), the 25th of May - Memorial Day this year - provides a pretty good climatological average for seeing action in the TX/OK/KS/NE corridor. Considering that the 24th or 26th of any of those years could also provide action seems to point toward Memorial Day weekend as the centroid of a contemplated chase trip. Now, if I can just convince my brother and figure out if I can afford it...