Isn't that bug post pointing out the extended duration of fear and the DoTs is a bug? Fear lasting 10 ticks is insane, and obviously not as intended. Naturally that would work better, but it's not "classic"
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Selo's DoT kiting allowed me to land all DoT's *just* before or after having to recast Selos, though if I remember I'd cycled through the DoT's, using two each time to make sure Selo's never dropped. That would put 3 DoTs on the mob every second tick, with two otherwise. Much better to miss one tick of a DoT then get hammered from Selo's dropping. Often mobs were resistant to one of the DoT's too, so I never lost much by it being cycled out. I graduated to this over reverse fear kiting as soon as I got my third DoT at 46.
Which brings me back to the original point really - it's safer to play the inside of timers, than push for a "perfect" result which is rarely going to happen, especially where something critical like Selos or resists are involved. The lost time/XP from a death way overbalances anything gained from sneaking in that extra tick of song.