Originally Posted by
dkyle
Double Strike and Off Hand Proc are two different things. You appear to be conflating them. Tempest 1 and Tempest 2 both provide an additional +10% to offhand proc, above and beyond GTWF. This determines the chance of an offhand attack happening.
Double Strike gives a percentage chance to have two main hand attacks instead of one. That's what the 105% means. On average, you have 105% the number of main hand attacks compared to someone with no double strike.
As to why Tempest 3 gives only 5% instead of 10%? Double strike is worth more DPS than adding offhand proc, since your offhand weapon only gets half your STR mod. 10% doublestrike would be a greater increase in DPS than the 10% offhand proc of previous tiers. Tempest 3 is somewhat less an increase in DPS than Tempest 1 and 2, but not by an unreasonable amount.
Also, what's with all the blank lines?