Crowding the head of a fly is a common mistake I used to make too, and still do sometimes. Leave yourself some more room in front of the lead, about 1/4 of the hook shank's length. Use a smaller diameter weighting wire, 0.015in is about perfect for a size 14. Taper your thread from the front and rear of the lead, build a little cone of thread that steps down from the lead to the shank.
Legs are always tricky. A.K. Best advocates tying in a small bunch on either side, as you are doing. I'm not sure strict uniformity is that important to the fish. Try using ostrich herl for legs too, easy.
I only use head cement on big streamers and slippery (GSP) thread. I don't think it's that necessary for most trout flies, if you execute a good 6 wrap (what I do, but not sure if this is always the correct amount) whip finish by hand with good tension on the thread. When you cut the thread, do so by "wiping" the thread against the edge of your scissor. This produces a cleaner cut and leaves a tiny bit of thread sticking out of the head (that you can't really see), thus making it less likely to fail. I am a strong advocate of whip finishing by hand; no other tool gives you the same feel or control.
A good book always helps. Look for a book about techniques, not just recipes. A.K. Best's Production Fly Tying is a good example, but there are many others in this forum. Do a search in the forum on "fly-tying books."
Torrey (Nymphmeister) at Housatonic River Outfitters (HRO) offers free tying classes from time to time on Saturday mornings. Attending one of these will fast-forward you up the learning curve like nothing else.
Hope this helps.