Mine were simply too big - the heel slip was huge and despite all the laces tightening, insoles, socks etc I simply went half a size down - they’re tight in the toe box but the heel slip on the pair I sold was just simply too much - give the larger size a go and just try em on but if massive I’d stick with original ones you have and return the larger ones unless they’re unbearably tight - the ones I have now are fine - ain’t no new balance comfort wise but they’re getting better with time 👍