Breakage Gone Wild!

HAIR:
brown, fine-medium, mid-length, wavy, dry & layered

PROBLEM:
2 mo. ago I cut heat styling down to 1x/wk; 4 wks ago I eliminated it altogether...but my hair seems to be getting worse. I just had to cut 2" of breakage off since my last appt. & would love some advice bc it seems like I'm doing all the right things. My stylist is at a loss & my hair isn't long enough to keep up at that rate!

CURRENT ROUTINE:
-trims every 4 weeks at Aveda salon for past 9 months
-no coloring/chemically doing anything for almost a year
-using the Damage Remedy line from Aveda
-sleeping in the Dry Remedy Mask 1x/week
-only brush w/ wide-tooth comb (mainly in shower once conditioner is in, & after shower once Aveda Brilliant detangler for heat/damage is used)
-wash every 2-3 days
-rotate btwn. Bb Curl Conscious Creme & Living Proof curl cream, after use detangler & Damage Remedy leave-in treatment.
-limiting time hair is spent in ponytail to gym, & even there it I limit that time; only using the "ouchless" hair-ties (not too tight & I even move around the tie so it's not putting strain on the same place for too long!)
-taking biotin 10,000mcg daily
-take daily vitamin and eating healthy
-stress limited to pretty much just the frustration with my hair!

HELP:
-I am inclined to think it's the Aveda products, as I only started using them a few months ago - of course the salon girls say no way, but by looking at the ingredients there really doesn't seem to be any reason for that to be the case.
-I'm getting a satin pillowcase today but beyond that I don't know what else I should be doing to avoid damage & finally get my hair to grow out!
PLEASE HELP!