[lorinda]

5 or 6 players remaining with my stack somewhere around 500-600 at the 50/100 level.

Sounds like you are panicking too early, this is not a terrible position.

I don't feel like I'm playing poorly but my ROI after 400 games is a whopping 10% so maybe I am playing poorly

Remember that some of the people here are amongst the very best on the net.

To be making 10% ROI, you have overcome a 9% rake and won 10% on top of that, so you are doing 19% better than the average player.... far from being poor and it means you can learn and get paid for it.

Lori