By who? Who came up with these equations? Anyone you know? Have you seen the code for yourself?
Kirschy has done a lot of extensive testing on haste. While I'm sure she didn't make the formulas, she has certainly tested and confirmed them numerous times.

As for damage lost, look long term, DA isn't going to make up that damage lost, and therefore you deal less DoT. I think a few hundred Yagudo's are fair enough for a good test.
You don't know how DA works and you don't know how STR works. Any test you do based on eye balling is invalid.

Ok, what was your average damage/hit with str+5 and without str+5. I'm not looking for 40-70 damage difference, I'm looking at an exact average.

For example.
Let's say you hit 10 times. 100 101 93 95 110 89 115 102 101 105. out of those 10 hits, your average damage/punch is 101.1 If you don't have an average before str and an average after str with an exact number of hits used, then your "testing" is 100% invalid.

Believe what you want, replace STR and Haste gear if you like, I won't be as previously mentioned. Because at the end of the day, there are many theories on dmg output floating around, to follow them blindly puts you in the same boat as everyone who once thought the world was flat.
Again, I would really be willing to bet my Corsair could out damage your monk.