I don't think you need to be concerned... I'm not. After running SB-E for 2 years @ 125 x 36, and if anything, CPU got better, I don't worry about such things.
And yeah, listen, if PCH stays @ 100 MHz...and CPU runs @ 115 MHz...how often does clocks in each domain mesh properly? 125 divider DOWN to 115 would be easier...full blck is only available by divider, really. The Bluetooth module is relatively sensitive to BCLK adjust, too, so if you have that disabled, you can just enable it.