Siraj, I have that center issue with one of mine that's not been replaced also...
Here are my most recent sessions combined...
Cubes Solved: 24
Number of Pops: 0
Average: 2:31.07
Standard Deviation: 9.30
Best Time: 2:09.63
Worst Time: 2:45.84
Best Rolling Average: 2:28.28
Individual Solving Times: 2:27.66, 2:34.96, 2:28.56, 2:35.36, 2:23.66, 2:15.61, 2:31.02, 2:34.75, 2:35.55, 2:39.27, 2:38.41, (2:09.63), 2:23.25, 2:41.96, 2:26.94, 2:14.31, 2:44.22, 2:41.08, (2:45.84), 2:27.22, 2:27.31, 2:31.86, 2:30.68, 2:36.58
I took a break after the 2:09 to watch the super bowl.
Ok... i hate doing this:
Average: 2:19.86
Individual Solving Times: 2:20.34, 2:29.15, 2:27.66, (2:03.65), 2:20.69, 2:19.63, 2:16.97, 2:12.81, (2:30.09), 2:16.47, 2:18.93, 2:15.94
Getting way better.