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+20 speed difference <~ I humbly ask for permission to temporarily remove this

You can't remove it since it is correct.

(780*4+60)*(1.2+1)*95.2381=666285.748

(785*4+60)*(x+1)*86.9565=666285.748
x = 1.394
ceiling(1.394) = 140
140atk(+5str) speed5 = 120atk speed4
140-120 = 20

20atk difference.
An equally scrolled lunchbox is 11atk better than an executioner. And 600m cheaper.

Your "2%" is not even half of the true value:

((780*4+60)*(1.2+1)*95.2381)/((785*4+60)*(1.29+1)*86.9565)
= 4.5% advantage

11atk/4.5% difference. Now you might not think that is much of an increase, but how about you use common sense for once and consider the worth of 11atk. Take your cape, shoes, or glove and add 11atk to that, and tell me how much that item would cost. That is a huge improvement in terms of equipment.

the 7.5% dmg boost (could be higher) on the Executioner proves to help more towards 2hit, 1hit KO-ing.

You use a 2h sword when you need to 1-2 hit something.