Well that's like double LDR. Distance and time both separate you guys.
How often (or seldom) do you hear from them? When you do hear from them, is it usually by text? phone? email? skype? etc.
Perhaps if they could just do some little thing to keep in touch with you more. A text at the end of each day, even if it's short. A phone call you can expect on the weekends. Maybe a combination of things. You need a negotiation process to brainstorm which kinds of concessions they can conceivably make.
You must be pretty busy with your own job. What do you usually do with whatever little spare time you have? It could make a difference on how well you can cope with this LDR thing, but I think you're also in need of finding the courage to bring up some difficult things with your companions.
Does interacting on Polyamory.com help? How can we be of a better help?
Hang in there, things will get better.
Love means never having to say, "Put down that meat cleaver!"