I am talking about this page: https://github.com/alkcorp/GTplusplus/wiki/Multiblock-Processing-Logic

First (easy to fix):

It says

There's also code saying that the recipe cannot be reduced below 1 second.

and

If you had gone one tier up more, you would've noticed that the recipe time wouldn't go below 1 second, but anyways that doesn't apply here.

I pretty sure this is incorrect and should be 1 tick instead of 1 sec.

Second (might need a look at the code):
Stuff like

2457.6 eu/t

does not exist. Instead stuff is rounded which can make a big difference (upto 2x) once recipes are overclocked close to the 1tick limit. I dont know the exact details, but as described here #658, it seems to be the recipe time that gets rounded down and eu/t remains uneffected.