What was the date of the battle exactly?
That's important regarding the technology gap. F.e. before 1999 you have to invest on large amounts of antitank units with TI sights, since the Chinese had none until then.
Honestly, I don't see why your contender should have had three times as much points as you had, the game is meant to be balanced, so technology-heavy units like modern US tanks, AFVs at large, hslicopters etc. are way costlier than more basic units.
Huh, then there's not much point to have such a differnece in the point numbers since the mentioned technical gap in closing fast enough...
So IMHO, except if you both agreed that the strategical context and the settings of your game implieed that the US could only field limited forces, you have to admit that you have been creamed on the rules!