I assume you're already using ThrottleStop, or an EFI that has powercut invoked in it naturally. How do your power and temps look? Both of those tend to get *much* higher, and quickly. (On my machine with dual sockets, I can't exceed x32 when using all 18 cores)
Are you using one of the EFIs that reduces core voltage? That'll be a necessary part of the process, and even then, there's some silicon luck in how much you can do so and still maintain stability. I've seen folks in these forums get as good as -100mV, though personally even a small undervolt usually doesn't work for me.
Did your system actually boot? I've yet to hear of anyone successfully setting bclk higher than 105.9 on any of these chips. (I current run at 105, perfectly stable, but from what I understand, even that is somewhat lucky)