I've seen some strains require 10-12 weeks. If they started showing signs of flowering 5 weeks ago, then you def have an early flowering strain. I have some Mazar's outside that aren't even flowering, but right next to it you will see my White Widow starting to develop flowers.
My recommendation would be to let this strain run 10 weeks, or more if it will allow you (you check this by looking at trichome structure/color through a magnifying glass). It should def gain a good bit of weight in the final weeks, as that's the most rapid part of the flower phase.
Have they been fed properly? What is your feed schedule? Nutrients used? PPM/PH levels? I don't see any nutrient deficencies that are obvious in the pics you posted, but if you are not feeding them the proper dose of carbs, I would at the very least add some organic molasses to your feed so that they will have that extra energy boost for bigger yields and more trichome production.
Keep me posted!