You have to be careful comparing to Ivy because most of those results are on GPUpi 2.3.4 or earlier, which is much slower than 3.2. Also many results use Intel OpenCL instead of the much faster AMD one.
A 3570K @ 5.25 GHz scores 32sec 510ms in GPUpi 3.2, my 651K result scaled up to 53 secs would be around 39 seconds or approx. 20% slower. This looks completely reasonable to me.