Capacity gone?

What device are you using to get these numbers?

 

How are the charge cables that are being used to charge / discharge the modules? The hobby charger may not come with cables and these are frequently built by hand. The same thing happened to my friend where the discharge / charge amp hour numbers were terrible. Had a close look at the cables that he was using and the problem was bad soldering between the wires and alligator clips. Not sure if these cables also had a high resistance when checked with an ohmmeter or not. Once he fixed the cables, the discharge /charge numbers went back to normal.

 

I was getting very similar results before I did a couple of things:
1) I changed out my cables as suggested by BrokenPipe . One thing that clued me in was that the cables were getting very warm when it was charging with 3.0 Amps. I bought some wires off of Amazon that very much looked like 18 AWG cables. Upon further inspection the actual copper conductor was more like 22 AWG with a fat insulator. So I remade all my cables with actual 18 AWG cable and my numbers improved.
2) I changed my minimum voltage from 6.0V to 5.0V as recommended by some members on this forum (mr_guy_mann) as well as battery universe.
With those two changes I am now seeing number go up into the 4000-5500mAh ranges (which is my goal). I am in the middle of the repair right now so I don't have final numbers.
On the weaker performing cells I may take the voltage down to 4.5V to see if that improves their capacity.

 

I've taken them all the way down to 0.06v per module (0.01v per cell) which was what Hybrid Automotive/Prolong originally recommended and it works even better. And the slower you can make the discharge and recharge the better the results.

I remember 5 years ago when I told Professor Joe < https://2ndlifebattery.com/contact-us/ > who teaches Hybrid & EV at a college that I was reconditioning on the 3rd round that low he laughed at me. Then last year he mentioned that by accident he discharged some modules with his super expensive equipment near as low as I recommended and measured a significant improvement in capacity compared to his other method. It's now his standard practice.