With the extra baseline survivability of glance/evade, Forged in Fire can handle your healing needs without Cruel Delight.
My understanding is atm Hammer is top tier in dps in normal crit form, and the Signature dps does not bring it to that level but it’s as good as the lower end weapons in crit builds.
For me survivability is a bit down in my crit gear but I also dropped a crit glyph (since CD is worse anyway, I went to 4 crit 2 crit power instead of 5 crit 1 crit power, better dps but fewer CD procs), and now it just actually matters which damage buffs DA bosses get. GK with stacking enrage can kill me pretty consistently through 15k hp with Forged in Fire + CD.
Due to the way extra hp works, the Hammer signature is not actually good for survivability, only its passive… definitely better off using a chaos or shotgun one if possible.