Originally Posted by Crepusculu
I wasn't necessarily suggesting that you should drop all your points in Improved Mind Blast to fit the scheme. The 0, 1, and 2 levels of mind blast I'm brushing off, but displaying for completeness.
Usually what happens in combat (with an odd number in haste) is that I'll run into situations where I have a fraction of a cooldown before MB cooldown is up. Since my DPS cycle is built around casting as many mindblasts as possible, the only real increase to my dps occurs around agreements in time, otherwise I'm waiting for the cooldown. If you take 5/5 mind blast, but the majority of the time you never actually use its last 0.5 or 1.0 seconds on the cooldown, then it seems wasteful.
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I believe your primary claim is that it is better to delay the casting of Mind Blast by a half or full second if it lets you get another full GCD worth of cast time in. You claim that with 5/5 blast you usually waste 1 second of cooldown from casting other spells. Another way of looking at the claim is that with 3/5 blast, you occasionally have to wait an extra second to cast your next Mind Blast (which also defers the cooldown of all future mind blasts by a second).
I disagree that trimming down to 3 or even 4 points in Mind Blast would result in a negligible loss of DPS! The extra delays add up often at every haste value I've been at (up through 300), measured by the number of times the cycle works out perfectly with 5/5 improved blast (at least 75% of the time there's no waiting).
In my anecdotal experience, Mind Blast has cooled down but I can't cast it yet roughly once every 90 seconds, or 4 times in a typical fight. That almost always occurs when the Vampiric Touch and Mind Blast cooldowns happen to coincide. I suspect you aren't interrupting your Mind Flays at the 2 second mark to cast Mind Blast when the cooldown is up. Without breaking flays then yes, you won't notice the DPS loss from taking only 3/5 or 4/5 imp blast, but only because you weren't taking full advantage of the damage 5/5 blast provides in the first place.