About to complete their 5th week in flower and still no large flowers yet?????

At this point you should have you flower buds well established and they should be everywhere.

Anyhow, if you SOG it, you want a 3 week veg period. Even shorter if you used clones.

Looks to me like you vegged too long...and...looks like they are still in veg. I just don't see the flowers. Maybe its the pic...but I would be looking for established flowers at this point.

To cut down on the growth, I would switch to 14/10 flower cycle.

Nice setup though!