I recently started taking HC seriously and started leveling a DH. I'm nearing lvl 50 and almost done with nightmare and was wondering if anyone could give me some advice on how to progress in terms of gear and skills.
Hell will be a tough ride, you should prepare for it. Your life pool seems fine, but your dps is a bit low for late-nightmare. I suggest a socketed bow for your level (should be cheap).
Caltrops is a great skill, the problem with it on later levels is that is consumes your much needed discipline! You use Entangling Shot, so two kiting skills is an overkill imo. I really suggest you squeeze in Smoke Screen for Hell, you can easily get into a situation where only that will save your life, trust me. To be honest I never used slowing skills post Normal, as stutter stepping always did the job, but it is a question of playstyle.
If you want to reach Inferno with your own efforts I recommend hitting lvl 60 before Hell act 3 and stacking some allres, and really prepare for Hell act 4, it is the killer of pre 60 HC characters
As far as farming goes, if you hit Inferno the 1 mil budget should be enough to gear up an act 1 farming DH.
If you need tips on good xp farming places or want to jump quests feel free to PM me.
EDIT: I forgot to mention Shadow Power. I notice you have some life after kill values, together with health globes I guess that keeps you up, but when fighting tough elites the lifesteal from this skill helps with the cause.