Hey Paul, glad you enjoyed your first solo. I'll try to help a bit but a lot of solo travel is experimentation and persistence. It has taken me years to develop strokes to efficiently paddle and I'm still working on it.
1) Tail Wind - You need to play around with your correction stroke. If you're doing the J-Stroke with your thumb down, try it with the thumb up (yes I know, goon stroke, but it is a good correction in current). Also, transition immediately into your correction, don't drag the paddle in the water. The best advice I ever got was reach as far up as you can and bring the paddle to your knee for power, then turn the paddle as it goes back to the end of the boat and immediately correct. Also, Canadian Stroke is an excellent solo travel stroke and it is especially useful in wind.
2) Weight distribution - I like to trip with two bags, a big one with tent, sleeping bag, food, etc. And then a small thwart bag with little stuff. That way, I can place the two bags, one in the bow and one behind me, and I can move them around to trim the boat. Correct trimming is vital to safe and efficient travel.
3) Beaver dams - Get out of the boat! I'm not sure what hung you up but going upstream or downstream, its always safest to get out of the boat and push it over.
4) Boats - This is a fiercely debated topic, so I will only mention the boats I would paddle. Like a lot of thing in life, personal preference is key. First of all, if you plan to do any whitewater, you'll need a boat with whitewater characteristics. Bell Yellowstone comes to mind, as well as the Esquif boats. But if you are just on flatwater, you still have lots of options. Narrow boats absolutely fly, can be tippy, and won't hold as much gear. Hemlock Peregrine and the Bell Magic are the two I like, but I know Swift and Wenonah makes good ones in this category. Ask the two Seans (of Ajax and of North Bay;) They both have good solo boats.
But you might want to look into a boat with a wider beam. It won't be as fast, but its more stable, you can hold more gear, and I find them more fun to paddle. I have a Curtis Companion which is no longer made, but Hemlock makes an Eaglet that is based off a Companion mold. Bell Merlins are also good. I can't speak to Swifts or Wenonahs. Also, if you're in or near Canada, Evergreen makes good boats (they don't ship to the States)
The best advice I can give is to paddle different boats and see which ones you like. Check out the classifieds and the internet; there are some great boats for sale right now.
Glad you had fun and I hope this helps.
Tenzing
Tenzing
http://tenzingsadventures.blogspot.com/