Hi Michael,
 > Although the bread tastes perfectly delicious, I get "stretched" areas
 > where the braids meet, which fail to brown as nicely as the rest of the 
loaf.
You are missing a few bits of information in your messagehow much sugar 
is in your dough and for how long are you baking the bread for me to 
fully diagnose your problem, but I do have a few suggestions.
I see the "problem" you describe when breads brown very quickly (I don't 
really think its a true problem unless this look really bugs you). You 
could try to just bake the bread a little longer, tenting it with foil if 
the extremities are starting to color too much. Or try baking at 325, but 
also for a longer time.
I usually bake a 1-pound hallah for 30-35 minutes at 325 F if there is a 
lot of sugar in the dough, or at 350 F if it is less sweet.  For hallahs 
with no sugar, I bake at 400 F for the same amount of time.
Hope this helps!
Maggie Glezer (who is currently at work on a book about hallah!)