Mine (five-net!) are also in week 14! very similiar except my smaller 3 are flowering more as of the last two weeks. Are you using Sodium (HPS/SPS) or;
MH Bulb? Should be the red wavelength now;SPS rather than the MH, eh? Not to worry about those leaves; typical from what i've seen.
Is your 'time' cycle 12/12? that's what's pretty standard at this stage.