Is this normal....lipo

[speed demon]

Hope you guys don't mind but I have another question. I have put on another 15 cycles on the lipo and noticed something strange. I ran the lipo all the way down again and when I plugged it into the charger the cell volts were 3.31, 3.23 and 2.99 Is this within tolerance or the cells suppose to be closer then that? It's still giving great power and run time. I was thinking about getting another since my friend built a flat oval dirt track for us to race on. What would you guys suggest? Looking for 20-25c 4000-5000mah 3S. Also looking to spend around 160. I like what I see about kokam but not sure. thanks