Fear Me is great for messing up a whole zerg of people, but given how WvW fights can be shortlived, considering healing done over 100 seconds becomes a lot less relevant. I mean you're just as likely to be defeated before your shouts even cooldown, as you are to be sustainable. OMM would give you more healing, but it only affects a single person, so for WvW I'd take Fear Me. On the google spreadsheet you can see a data series considering a WvW idea build, and how it compares to other healing models.
As for Runes, Soldier runes DO clear up conditions from your allies too. If you consider how your Shout Heals affect other allies, so too does the condition removal. I watch the party health bars when i use the shouts, and i see conditions disappear off allies. So unless i've been experiencing an abnormal amount of coincidences, Soldier runes apply to allies too.
Healing Signet is nice for WvW, because you have to consider (like i mentioned before) fights could be very short lived, and so you might get to use 3 healing signets, where otherwise you might only get 1 or 2 of the other skills used. Plus the application of regeneration is also nice for the same reason Fear Me is nice. The more people you "influence" with your skills (i.e fearing a Zerg, or healing your own Zerg) the better. Your ability to affect whole groups around you is a pivotal quality indeed.
As for Sigils, that's a tough call. You don't have a very DPS oriented build, perhaps you could go for Sigil of Paralyzation, since you could Earth Shaker a whole Zerg, and instead of a 2 second stun it would be a 2.3 second stun, which can be quite a difference. But i don't know, Sigils are difficult because there are so many, and they flourish in different environments.