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If you use firebalst on every cooldown with 1/3 improved and perfect timing, you will see a DPS increase of somewhere in the 5% area but a much greater increase to your mana consumption and a decent range reduction compared to scorch not to mention fireball.
To do anything "on clearcasts" will generally reduce your DPS by quite a bit unless the sum of your ping+reaction time is near-zero which isn't realistic at all. Stopcasting doesn't matter here as you need the server to send you back the clearcast proc after your spell is finished, but if you're casting fast with stopcasting as you should for good dps by the time the clearcast proc arrives at your client you should've already pressed the key for the next spell, meaning you will have to move to cancel it and cast whatever you wanted to cast on clearcast, costing you ping+reaction time which is generally too much to be worth it.
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