Jeffrey - Here are my thoughts on your questions based on my experience with the April 2011 exam (which I passed). 1) You probably did spend too much time on hydraulics, but don't worry about it now. I would not recommend doing the hydraulics review course. That time will be better spent on another topic. 2) I was slow at problems too. I did 3 timed practice tests (only 1 in a single day!) and could never finish the morning section in 4 hrs. On the actual exam I finished the morning 30 minutes early. 3) For the material left to cover, divy up what you haven't covered according to % covered on the exam.
Some other thoughts:
Re: Air - I didn't work any problems in the EERM. If you can get your hands on the 101 Problems by Schneiter, the air questions in it are very thorough. I did find the slides from the NCSU DVDs very helpful on the air section during the exam.
Re: Solid Waste - Again, the 101 Problems were helpful. A solid reference is also a must. I used Integrated Solid Waste Management (Tchobanoglous) and Hazardous Waste Management (Lagrega).
Re: Health & Safety - The NCSU DVDs were helpful. Good references are key. A copy of the NIOSH Pocket Guide is recommended.
Re: Site Assessment & Remediation (new topic starting April 2011) - None of the study materials adequately address this in my opinion. Luckily it's what I do, but I could definitely see this being a big problem if you don't work in this field. My best advice here would be, again, get some good reference material and familiarize yourself with it. I recommend Practical Design Calculations for Groundwater and Soil Remediation (Kuo). Also have a good groundwater reference (like Applied Hydrogeology by Fetter). Also bring a copy of the Federal Drinking Water Standards.
Re: Practice tests - I started three weeks out. I had the Schneiter tests (3) and the one from NCEES. I did the first Schneiter one untimed in the weekday evenings just to get a feel for it. Then for the other 2, on the weekends I did morning session on Sat, afternoon session on Sun, timed. The Monday before the exam I did the NCEES one timed, just like the real thing. It was a brutal 3 weeks. Take the day before the exam off.
Good luck!