Without going into all the detail it would be fair to say that prior to the attack on Washington the strategic balance was probably about to tip toward the USA. Casualties had been very high on both sides and the USA was better placed to cope than the CSA. The USA had also just cleared the Shenandoah and captured Fredricksburg and was thus threatening to either march on Richmond or better yet to cut off the CSA main force from its bases.
Be that as it may, Washington fell and the -50NM scored caused the immediate end of the war.
If this had been 'real life' I wonder if the USA would really have collapsed if Washington was lost. It had strong forces in good positions to cut off the CSA army. It had its main centres of population and industry untouched. Grant was starting to get victories in the West. Would the people of the North really collapse just because the White House got burned down (again)? I rather doubt it. Certainly the rebels did not surrender when His Majesty's forces captured the place in the American War of Independence!

So why is

I can see from a game balance point of view that the weighting towards Washington can help the CSA win more than it might otherwise but is the balance right?
Perhaps Washington should be worth less and/or Richmond more (say -40 and - 20NM respectively)?
Discuss!

PS Where can I change the values if I want to mod this?