I'm pretty sure that people having trouble moving from $50nl to $100nl just have to learn to deal with the swings properly. Every time you move up, the swings become more than double the previous level due to better players on average and double the stakes.
If you are consistently beating $50nl, you shouldn't have too much trouble at $100nl.
Ask me whatever questions you want about $100nl and the transition from $50nl. I've been there too.
Some encouragement:
$100nl since April 1st...
