As a ranger I'm actually less concerned about endurance than the fact that almost ALL of the chain focus effects on gear at this level affect beneficial spells. It's very hard to find a focus that will actually effect anything I cast a lot. They need some detrimental effects on this gear.
If you are running out of endurance as a ranger, something is wrong. Jolting kicks is something you do to drop aggro, not a DPS effect. Mindlessly chaining jolting kicks is akin to a taunt mashing warrior, both are missing the point. Save it for when you need it.
I don't see the other discs being a problem, as they don't come near to using even half of your end pool.