Sypheks reply was on point! Your torsos are actually in porportion now. Also keep in mind some concept artists are specilized e.g. they only do mechs and interiors and on the other hand some people in smaller companies are generalists.
Definitely keep going with the hampton, basically the whole body can be simplified into forms. The eye level and correct perspective also plays a good part in how figures look too (I'm still getting used to including a plane for the feet and shoulders) so you've got a good foundation.
Note, if you ever want to go more indepth with the anatomy forms in the future here is Kevin Chen's blog: http://analyticalfiguresp08.blogspot.ca
He has a similar construction style to Hampton although more advanced.
Your advice needed:
Since you said you've glossed over some parts, would you think it would be ok for me to go strait to "how to draw planes in perspective" to apply some of the principles I've learned already (e.g done up to page 60 or 80), even though I'll still finish the whole book. I feel like it would be beneficial to actually start using my perspective knowledge but I don't know how yet. Should i just wait until I finish all the exercises? Everything seems so relevant :S.