Ok I was able to get my hand in there and I adjusted it ALL the way... I think I tightened it all the way. I took it for a test drive and DEFINITELY noticed a vast difference. It upshifted very early. But I got it to downshift into 1st gear (with kickdown) at 23 mph, instead of 18 mph like before. I got it to kickdown into 2nd gear at 58 mph instead of 55 mph like before.
Also, my 2-3 shift didn't seem right, it always seemed to take a little longer, almost like it was flaring, but that improved 50%.

So the results of a full hastening of the Bowden cable are:

Earlier upshifts.
Later Downshifts.
Improved 2-3 shifting.

I will drive with it fully adjusted tomorrow to see how I like it. I am guessing that I will probably be loosening it back up just a little so that the upshifts are SO quick. But just a little, because I LOVE the higher speed downshifting!
(Weird going from a fully loosened cable to a fully tightened one in about an hour! THe driving difference is phenomenal.)

Will keep you all updated on my final results.

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)