Pick which ROM you want to flash...if you are on the 3.0...stick with it.
Download the 3.1 ROM and take the kernel from it...the 407 kernel. The 3.0 ROM has the 406 kernel.
With the flash tool, you can flash only the kernel (without erasing IDB). You can go back and forth between kernels and see if you notice anything different. Just figure out a way to keep track of which kernel you have.
You can name the 3.0 kernel kernel406.img...and name the 3.1 kernel kernel407.img and direct the flash tool to whichever one you want.
Maybe our kernel experts can make a batch of custom kernels for each one to try. (Hint)
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