I kept records of my batteries for about 6 months. Here's what I did:
Initial charge/discharge cycle on my GFX's, record readings.
Discharge trayed until voltage was 0.
Deadshort for a few days.
Zap at 70 on my Integy 3300.
Let the cells rest for a day un deadshorted.
Tray them back to 0.
Charge/discharge cycle again, record readings.
Did this once a month and had the readings in an excel sheet.
ALL my packs had voltage increases and decreased average internal resistance according to the Turbo's. Runtime did not decrease from the initial readings. The voltage increases do eventually top out, as do the decreasing AIR numbers. I got almost 2 years worth of weekly racing out of those packs before they became practise packs.
All non-scientific findings by a club racer with too many toys
No controlled environment testing (just in my bedroom), but I'll keep zapping and dead-shorting my batteries