This build has been hailed in high regard by everyone who has seen it and I even got people who were never ranger mains to main this build after seeing it in action and taking it for a test drive. I've done the math and I'm 100% confident this is THE best build for soulbeast not only for damage, but for survivability too.
The build: http://gw2skills.net/editor/?vNAQNBjYD7kSFohFshXwlFgrFsMJYOTuLXmrJA84mA552gbytEpPH-jZhIABc/EAouMw37P4/FAAgDCAA
WHAT CAN BE CHANGED WHILE REMAINING VERY EFFECTIVE
With this build you have some room to wiggle through, but in my experience this is the best version of the build when it comes to overall effectiveness. Changes I've seen include: offhand dagger, surging rune, water rune, menders amulet, annulment sigil on sword/warhorn, sigil of energy on sword/warhorn, Second Skin, and Evasive Purity.
WHAT CANNOT BE CHANGED WHILE REMAINING VERY EFFECTIVE
Anything that deals with boons shouldn't be changed. As the build is right now, you have access to every boon in the game and considerably high amounts of them. The heal "We Heal as One!" is absolutely imperative because it doubles your boons, AND it gives your pet double the boons you have. [For example: Using Call of the Wild will give you and your pet 3 might. Since you have the trait "Fortifying Bond" your pet will gain 6 might instead. When you heal, you now have 9 might because you copied the boons from your pet. When you merge you have either 24 or 25 might (I've seen it be either one, not sure which is mathematically right but it's always at least 24 might) due to the trait Fresh Reinforcement. This 24-25 might will last upwards of 10 seconds. 25 stacks of might instantly for more than 10 seconds with just an initial application of 3 might.] Another thing that is absolutely unchangeable is the specs, and and all the soulbeast traits (except with Second Skin which I hear is pretty good). Lastly, to remain effective, you cannot lose Dolyak Stance, Lightning Reflexes, or "Strength of the Pack!". All of those skills are optimal for the build, no exceptions. The signet of stone can be changed with signet of renewal for more cleanses and clutch situations.
HOW TO USE THE BUILD (WOMBO COMBOS)
If you've ever played core ranger, thief, or revenant, the build should come easy to you. I'll start by stating that this build has 100% uptime of 25 might. Let me repeat that. 100% uptime... of 25 stacks of might on you. This easily testable fact is why I say that this build is the best for damage, MUCH better than marksmanship soulbeast by miles and miles and miles and miles. Also, it has a handy dandy 100% uptime of protection, swiftness, fury, and vigor.
Here are the 25 might stack wombo combos:
1. Call of the Wild > Heal > Merge with pet
2. Hunter's Call > Strength of the Pack> Heal/Merge/Mission accomplished
3. Swap to Sword > Heal> Merge
And many more, but these are the easiest to know.
This build also currently regens nearly as much as warrior does due to the regeneration from Windborne Notes and the protection regeneration from Rugged Growth. Not only that, but an easy way to reset is to swap to Jarcanda and merge to use your new f2 (Photosynthesize) and f3 (Spiritual Reprieve). Unlike all my other builds, this build is not a duelist. It can and will win the matchups against engineer, thief, scourge, ele, guardian (non bunk, but you can pressure the heck out of bunk), and revenant. It cannot win any of these while on the node, though. This build is a roamer and +1er (Not to compete with thief; in my opinion their roles are similar but not the same. Thief +1's and decaps while soulbeast +1's and can stick around for the teamfight). And don't forget, Hunter's Call + Rapid Fire is what you want to spam.
This is the best soulbeast build for sPvP without any contest. It isn't a dueler but it will beat all other soulbeast builds in a duel. It's ridiculously fun and versatile. Tell me what you think about it.