ok ill try and help
Bowmaster in my mind is THE solo set for hunters, its skills are all about Strength Stance and definetly makes the hunter guardian unfriendly (as youll be pulling agro from everything)
Heres teh 4 set bonus : +15% Ranged Crit Damage, +20% S:Strength Damage, +25% S:Strength Threat, +25% S:Strength Power Use
so as you can see its 20% more damage for 25% more threat and power use, with 15% better crits. So that heart seeker will hit for a minimum of about 1600
(my max on it has been 8000
)
Trapper of foes, im really not a fan of, imprpoves the hunters CC ability but lowers damage output but also makes them more group friendly as a result, Its skills are base on Endurance stance. The good side of it turns Penetrating shot in to a root but i just cant see why at 4 set the total of -25% damage for the ability to cast instant in combat traps is worth it.
Huntsman ive not tried yet as most of its abilities complement Fleet Stance, the newer Hunter stance gained in the 50's which allow shooting on the move but only with auto attacks, it stops you losing focus as soon as you move but apart from that ive yet to truly test it.
personally im aiming at 5 Bowmaster Which gives me the legendary Cool Burn (making the Burn Hot ability a quick ending combo)
and 3 HUntsman which improves inductions by 10%