By all means take a LOOK AT THE PROGRESS JOURNAL SECTION, BUT DON'T ASSUME THAT WHAT WE ARE ALL DOING IS IDEAL.
Oops sorry Caps lock on there.
I wouldn't worry too much about your fat%, but you can get an estimate from machines in Chemists and supermarkets.
If you feel your back and your quads are getting too bulky there are three things you can do:
1)increase the reps to 15 or 20 for maybe 3sets and reduce the weight. Still push yourself with the other muscles and keep the reps low (say 8-10 still 3sets).
2) only work these muscles as part of compound excercises, drop any isolation work you are doing on them if you haven't already.
3) Only work them on one day, pos with 20min cardio after.
Whatever you do don't stop working your back all-together that could be dangerous.