A picture from George Morris's book:
I don't jump, so my forward seat riding has all been on the flat. Concerning lower leg: books from the 30s-60s tend to have the toe pointed out around 30 deg. Chamberlin recommended 15-45 deg out. For Hunt Seat Equitation, George Morris had it around 10 deg out, IIRC, but I guess he doesn't mind larger if it works for you ( http://www.amazon.com/American-Jumping-Doubleday-Equestrian-Library/dp/0385410824/ref=la_B001JP4RKO_1_4?s=books&ie=UTF8&qid=1388706453&sr=1-4 ):
Given the too large boots you were wearing, it would be tough to guess how your calf was against the horse. If the contact was with the back of the calf, that is wrong - too wobbly. FWIW, my favorite book on the forward seat is Chamberlin's:
However, some of the things he recommended are now frowned upon, like riding with the stirrup in the home position. I do it, but I seem to specialize in doing things that are frowned upon...