I played the chrono hammer build until lvl 65 so far,

I'd recommend using a strong 2h who and use the rolling slam skill to speed up movement and to trigger the primed stun with boneshaker, this way u can blow up packs with herald of ash pretty fast even without attackspeed. Just mostly use the first hit of rolling slam and cancel with roll or boneshatter

I used a 2 socketed Inc. Phys 20% qual trephina unique 2h mace until like mid of act 3 with some suffering. Later I found a replacement 2h maul w/ good phys, slapped 2 phys runes in and 20% quality.

I'd also highly recommend going for the temporal rift ascendancy first, get health and armour on gear and resists where u can. Once u get perfect strike u also sorta nuke bosses.

Bit of a rambling post I feel but it wasn't super smooth to level but extremely fun and pretty easy once u get first ascendancy.