2) Yes, you could easily stack a Test Booster and/or ZMA with HemodrauliX to acheive more positive results. We recommend HyperTest(It contains both ZMA and Trib.), but there are a slew of great herbal formulas out there. I personally like all of the products available from Get Diesel Nutrition.
3) I can actually relate to your reservations about being overstim'd, b/c I sometimes train in the evening and still like get a decent night's rest. A few products that I or others felt were excellent at providing energy and focus were R4W and RPM. I could still go to sleep after a couple of hour on R4W. Keep in mind that everyone is different and that you'll likely have to use trial and error to find what works best for you. Those products also double as test boosters as well, in case you're interested.