3 out of 4 of my seizures happened in the same conditions as you, WOT 6th gear for bout 10-15 seconds on the freeway. Pretty feckin hairy if you ask me. One of them was because I forgot to hookup the oil pump cable after doing a jet change. As for the other, who knowss? Cold weather on a lean setup? Poor gas? I'm just happy that its not as sieze happy anymore.
Coincedentally, the last siezure was because of a wack replate courtesy of US Chrome. I'll be trying Millenium next though.
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MC21 300R w/SE bits, Rossi 2001
MC28SE Silhouette Repsol