There will be no end to the tinkering :-). I'll probably not make any swift changes just so that I can get sample data. On a macro level I'm trting to get a small number fo 100+ yard rushers each week, but I agree it's still too strong.
I was going to post about rushing, but saw this thread was here already.
To me the focus shouldn't necessarily be on the 100+ yard rushers, but on ypc. That being said, I think (as you've already said) some tweeking needs to be done here.
In 2012 the NFL had 4 teams at 5.0 ypc or more, with the highest being MIN at 5.4.
Through games so far, there are 6 teams under 5.0 YPC in MFN with the median being at 5.74 ypc. In fact, only 11 teams have under the NFL league leading 5.4 ypc.
I don't know enough to know why this is happening, but certainly right now ypc is a bit high. If this is addressed, I would think the 100+ would take care of itself.