wow somebody who at least thinks about the things himself iam happy

better than ppl who just blindly copy everything
So I would agree with you that "master of nature" rubies is not necessary and that you could go that other route to save on rubies.
yeah cuz its supposed to be more pvp oriented and in pvp your pet usually dies fast

in pve i have the master of nature rubees
The hawk strike build I feel is still caster with a side of melee to support, making not really a melee build, but still a great build.
well warden is even in melee mode caster dependent if you dont use lightning strike all the time your dps will be just pitful cuz of no grab trigger

so when you have to use it anyway why not make use of the static stacks
On the other hand I believe you should check the dmg of clout because ive seen it do way more dmg than bears blow and hawk strike.
(you cant compare dmg from an aoe to a single target unless comparing both to a single target to determine the higher dmg)
ofc i ONLY count sigletarget there

the aoe effect is an awesome bonus in most situations

but even if you just read the skill discrption you will see bear blow has a higher base value and you also have +9% damage rubees for it and clout can only be made stronger with fist weapons
The "natural harmony" rubies I find a waste only because you shouldn't need more than one heal every so often with your dmg output being what it should.
once again this build was made with pvp in mind and warden IS squishy and you also have no healing burst or aqua so i think at least you should be able to use renew every 36 sek it will be good for you AND your team in pvp
Saying that I would put those rubies into lowering the cd of your "tigers strike" the backbone to the wardens melee dmg.
not sure if backbone

in pve tiger strike is complete crap in my eyes cuz the use will spend all of your combat wit stacks! so for a while EVERY melee hit will do lower damage until you are fully stacked up again :/ in pvp tiger strike can be nice as a little burst but in my tests tiger strike wasnt so much stronger than bear blow and i need the combat whit stacks for bark shield as a warden (if you have 8 combat wit stacks and activate bark shield you just have 36 sek cooldown and once again warden is squishy without barkshield say goodbye in serious pvp)
Last thing I just don't know the dmg output of "shield of nature" so I cant say how well it works, other then the times ive tried to use it, ive never really seen any dmg out of it.
sadfull those rubees were nerved :/ back then it was reflecting 100%!! was a sure kill of everyone who hits it

(btw its for melee damage AND caster damage but just in melee range) but still i found this doing a few million overall damage while 1 use when i was focused and cced all the time so i think the 1 rubee is worth it
i hope this will help you somehow