The problem with high core clock speeds is heat when you start pushing 8c 16t. You can find the best core and push the limits with by core overclocking but 5.5Ghz is most likely not going to happen unless you are planning sub zero cooling. You are running 8 cores in a package that originally was running 4 and trying to push that thermal load through the same surface area. You just cannot dump enough of the thermals through the IHS and into a cooling solution fast enough to stay out of trouble.
Running AVX offsets are great but the end result is that core clock speed drops putting you in the same performance boat you started with. If anything push for 5.2Ghz on the best core and run the other cores at a lower multiplier.