help

I don't know how to post and or where to post this...but here goes (and please some direct me) This is oldg and I've been at this for a few years now and am a decent "indoor" grower;however, my plants are only giving me back about 10 to 12 grms dry wt per plt. I use 3 gal. containers with a soilesless mixture (60% worm castings, 20% perilite and 20% vermiculite. For vegging food I only use Alaska 5-1-1 and for flowering I've been using Alaska 0-10-10 (however, I've just switched to the fox farm flowering food--the 3 pk): I'm growing my second batch of PPP right now and they are on their 49th day of flowering. Any suggestions? I'm currently growing PPP...I am also using 6 400 watt and 2 600 watt for lighting.

it all sounds fine 2 my barely experienced ears ( I've pulled off 2 indoor grows so far onto my 3rd now,,,but I have been harvesting 3/4 oz dry per plant)) how are you hanging your lights..? above or beside your plants..? how long do you veg.? and do you tip your plants.?