Franchise rosters??

I was just wondering what is the best roster to play with in a franchise ??
I was gonna use DK's but when i reach the second season all the ratings are stuffed.
i Know that people say u shudnt use tweaked rosters for franchise. but y wud it stuff up if u say took 10 off speed and quicknes and then added that to other areas??

It probably would not affect gameplay too much, but most tweaked rosters globally tweak ratings by multipling by a coefficient, without being balanced out by another rating. This can lead to the desired effect on gameplay, but is unsuitable for simulation.

I can't speak for DK, but as far as the NLSC tweaked rosters go, use them at your own risk, because they're not optimised for Franchise play.