Yes it could def. be your lie angle.. 3 degrees is a bit. Shafts could be making a bit of difference too. 

I also remember that when I was 13, my height was 5'5" or so and when I was 15, I was 5'11 3/4" (which remained constant until about 2005; oddly enough during an insurance physical my height was 6'1" - must be posture). I played standard lie golf clubs basically from 9th grade thru 2006 (and that included steel shaft woods). I upgraded my woods to graphite in 2006 and added hybrids. I still hit irons pretty straight but was constantly hitting my driver and fairway woods left. In late 2008 I then started standing more upright and that straightened the woods and hybrids out but I would get a sudden onset of shankitis with the irons (would occur mid way through the round or after 45 minutes of practice; it would disappear the next day) and it got so bad that I couldn't pitch or chip (I quit playing golf for about 2 months). As a temporary fix, I constructed a 38 degree hybrid, bought a 36" 9 iron and lengthened my wedges by 1/2" (the problem was then reduced to the GW). In Feb 2009 I constructed a set of irons (5-LW) and slowly started integrating them in the golf set. Never had a problem with the sand wedge and occasionally with the 9, PW, and LW. Could not hit the 8 iron and up. This is where the lightbulb hit! I made the 9 iron, PW, and LW match the sand wedge for lie angle and length plus went to a more compact backswing (the "stack and tilt") and the problem with shankitis DISAPPEARED. I played with driver, 5 wood, 9 wood, 6 and 7 hybrids, 38 hybrid and 9-XW for a year and managed to break 90 on a regulation course. I then found out my 8 iron was 1/5 degrees flat (adjusted it to 63.5 and, voila!, dead straight). In turn I adjusted the lie angles for the 5-7 irons (62, 62.5, 63) and started hitting them better (still remained with the 5 and 6 hybrids because they are a lot less work but was able to wean myself off the 38 hybrid). I have been playing a Vokey Spin-Milled 60-07 and 64-07 since last year. Given what I learned about proper lie angles, I had both of them adjusted to 65 degrees and that was perfect. I love these two wedges! Been getting a fair share of sneaky pars and birdies with them. I also came close to breaking par on one of the exec courses (par 34 with one par 5) and recently shot 42 for 9 holes on a 3100 yard course (my average score is 44 for 9 holes). Recently I took my old Black Cat irons (hadn't used them since 2008) and adjusted the lie angles to match those of the Titleist AP1s (62 deg for 5 iron, 64 for 9 iron and 64.5 for PW). Although the distance was nothing to brag about, I hit every club dead straight and managed to shoot +2 for 9 holes on a par 30 exec course. Since then I have upgraded my irons to Eye 2 green dot lie angle and it really does feel nice to have the distance I had 20 years ago (albeit with an 85 mph swing vs 100 or so). Bottom Line: if it doesn't fit, it doesn't hit!