Determine Injector Size/Duty Cycle

[180sxdan]

I have a 180SX with an S13 SR20DET Blacktop motor, the injectors appear to be stock but I'm trying to determine if they may be highflowed.
By using injector duty cycle calculators online based on RPM and pulse width (ms) I usually get some ridiculously large size.
Is there any way to determine the size of the injectors based on the map?
I know I'm running rich and will be installing a wideband over the next couple of days, here I have the map shown using a Haltech E6X ECU and in the settings there's no mention of the injector size.
Any help would be greatly appreciated.

Cheers.

[180sxdan]

Anyone have any advice at all?
Here is a datalog I took running 9 pounds up to about 5700RPM where the injectors maxed out (according to the ECU which I'm unsure of) but my AFR on WOT is about 10 according to the Innovate LC-1 I installed today.
http://www.filedropper.com/df03551-essentialdata

I just don't understand how such a small pulse width can result in a rich AFR if they are infact the stock 370CC S13 injectors.