I think the period of storing plays a role too....
Usually I got one week between race / practice sessions. After a session, I equalize my pack on an active discharger with 0,6 volt cut off. After one week, there's no problem.
But after 2 weeks, they are slower. Three weeks or more are real bad.
The first run (cycle) after storage, are quite bad. The second are okay and the 3 run are normal / optimal.
Soon, I will be storaging my packs for 3 weeks. I plan on to refrigerate them. I'm a little excited to see the result.
That's just my 2 cent.