It's common in the Backgammon world to use a different rating system to that designed for the Chess world - one that takes into account the match length as well as the difference in ratings between the two players. I've just won a 5-point match and seen myself credited with a single win ...
It's also a much simpler formula, lol - and can't cause a player to lose points for winning!

If you decide that this is an item worth following, among the thousands demanding your attention ;-), and you'd like some commented javascript for calculating backgammon ratings I'd be more than pleased to email it to you.