Yes, I do agree with Deltagrey on this actually....I think I didn't articulate my thoughts well before.
What I really meant to say is that if you think you don't have a strong GPA, you can try to compensate for it by doing really well in your Chem GRE and Verbal General GRE as well. Overall, I really don't think any of these are as important as your research credentials and letters of course (as we can also see from Deltagrey's case!) There are some exceptions though like Harvard that might care about all of these things though xP But I think generally, most of the top 30 schools can be quite lenient about GREs and GPA!
For example, I also had a friend who got into UW Madison with a 2.8 overall GPA so you will definitely have a shot!
It looks like your research credentials are pretty good. Just one piece of advice I think could be helpful: definitely try to get some "publishable data" by the time you apply! The process of publishing -- supporting information, submission, revisions, turnaround, etc can be really long and messy and you don't necessarily have to worry about having the paper actually out and accepted by that time. But even having a "first author manuscript in preparation" or "manuscript in preparation" will be very advantageous as admission committees can also tell if you have impressive publishable work just by seeing a very polished, professional research summary (for example, one of my friends applying this year didn't publish, but had a lot of good data, made a nice research summary, and noted "first author manuscript in prep" and was admitted to top programs like Stanford, Berkeley, Princeton and Yale!). I think this could increase your chances for admission too as research is the most important factor for grad schools!!