OP is right, about the resource. I'm surprised many people doesn't experience this yet.
What OP mean is that, the regeneration for resource is lacking at HIGH MP. Obviously at lower mp, this is not a problem as DH can slaughter most enemies before the need for regenerating resource. However, not in high mp where enemies just got much bulkier without substantial challenge to DH.
Hence high mp (6~10) only serve to slow DH farm speed and encourage the repetitive action of clicking at enemies.
I myself hunt at mp 5 and I found all the mobs to be easy, however the gold elite to be annoying (in terms of tankiness only).
What DH lack is reliable and high (single target) damage skills to deal with tanky enemies.
Obviously there are skills like Cluster Shot, etc which offer high damage, however the high resource cost, Cooldown, etc makes them not reliable (and also the fact that they consume a skill slot).
To explain the term "reliable":
-Let say for example: The skill cluster shot. I got 50% cc, and ~400% Crit dmg. 125 hatred.
Found an elite, shot it twice with Cluster Shot (100hatred), now for each shot, there is 50% chance for it to crit and 50% for it to fail on crit. On crit, the damage on each cluster shot is 1100%, but if it fail to crit, the damage will only be 275%.
With the high cost of cluster shot, now you have to wait for some time before you can shot another Cluster Shot.
Now for the battle, if you crit twice, it will be nice (The skill will serve it's worth for the cost of a skill slot and 50 hatred). The reverse is also true, now if you don't crit twice, you'll lament at fortune, and you'll need to wait for considerable period of time before you get another shot.
For 2 shot (100 hatred) with 50% cc, you can do the math by yourself for how many critical hit possibilities u can get. (25% to land double crit for 2200% damage total, 25% chance to land no critical hit for 550% damage total)
In this respect, Cluster shot is not reliable, since it can't produce the result you wanted when you need it. (it doesn't guarantee criticals against elite).
Do note also, cluster shot does not benefit from aspd increment due to the high resources, hence it does not correctly fit your dps. (not trifecta compatible, with some exception ofc)
-On the other hand, elemental arrow - Ball Lightning is reliable skill.
It got the same chance for critical, however the low cost of 10 hatred make it possible to be used multiple times in short period of time. In terms of will it crit or will it not crit, obviously in 10 shot (100 hatred) it has considerable chance for it to crit (and the odds for not landing a crit is very2 low) (In addition Ball Lightning can hit multiple times). Ball Lightning also benefit from aspd (making it trifecta compatible).
The only weakness is that, it deals just enough of damage. Hence is not a good choice for finishing tanky elites. (especially gold elites) And suffer in high MP.
Class like barb and Monk, does not suffer from this as they had reliable high damage skill.
Ex. Barb's HoTA - Smash (Trifecta compatible)
Hence often you see case where on the same mp same "single" enemy, a single barb/monk (let say 200k dps) deal equal damage compared to the combined damage of 3 DH/WD (let also say 200k dps each). (Assume all of them are spamming their best single target skill.)
DPS does not reflect true damage dealt due to skill potential
My advice to developer:
->to remake all the passive skills to more build specialize as well as introduce few new passives.
The skills for DH are nice, but when they are thrown to the metagame, most of them become useless due to lack of supporting factor to actually use them.
->On most skills, certain rune should be integrated to the skill as a whole.
Ex. Hungering arrow and it's Piercing arrow Rune, should be combined with the skill hungering arrow itself (In this case, it makes the other rune for Hungering arrow more reliable in nature).
Aside from that, to OP
-> Try replacing hungering arrow - scatter shot with Bola shot - Imminent Doom. Considering you're building Crit Damage and ASPD, I believe this will suit you more. For clearing mobs, Ball Lightning should be more than enough (as long as you play solo and on MP lower than 6).
Edit - Some details
Edit 2: Fix->Not resource regeneration, but resource cost
Edited by NuEloS#1547 on 3/13/2013 7:57 PM PDT