You're not even sub-30, this isn't "scientific" at all, 10 solves on each cube mean nothing, your times are so spread out you could solve 2 cubes with your "best" times in the time you solve one of your worst times, etc...
Also, a faster cube will obviously give you faster times, as long as you turn fast enough for it to make a difference.
Also, a faster cube will obviously give you faster times, as long as you turn fast enough for it to make a difference.