Nice test! Appreciate the work done ^^
However, I would like to share some opinions.
With regard to this testing, we have to bear in mind that the testing specimens that u bought for 3 & 4 worth approx 90m, which is incomparable to the tier of your main weapon.
For 1&2 -
average damage from mh: 877
Average damage from both mh n oh: 758
Total cd from weapons: 355%
For 3&4 -
average damage from mh: 831
Average damage from both mh n oh: 629
Total cd from weapons: 262
In comparison, 1&2 have higher 93cd, 46average damage from mh n also a higher 128damage on average mh n offhand damage.
I doubt a higher breakpoint tick would be able to outweigh this difference.
Personally think that if we were to use another set of 3&4 that could lessen the differential, ie total cd of total 300%, n slightly higher average damage from mh, I would yield different results ^^
An example would be mine
http://www.diabloprogress.com/hero/jayleo-6312/Hercules/19872277