Hey Lion! You've got some big girls there, they look healthy and strong.
I would usually never recommend to anyone to transplant once their plants are transitioning into bloom as it could halt flowering, however restricted roots will cause your plant to struggle to produce those nice buds you're looking for so i'd say you've made the right call to transplant. You're sure gonna need an extra hand when transplanting those big girls!
I grow my cannabis in fabric pots indoors & outdoors, i feel there are many benefits over growing with plastic pots so i'll break it down for you quickly:
- Natural air pruning of roots that does not occur in plastic pots. With plastic pots the plant's roots reach the edge of the container and are forced to circle the container in search of a friendlier environment. As these roots circle, minimal lateral root branching will occur. So with fabrics pots - as the roots reach the container's edge its root tips are trapped by the fabric and when they meet the air on the outside of the pot they are naturally pruned. This pruning process forces lateral branching of fibrous feeder roots to develop on the roots that are still within the pot. So i do believe it builds a not only stronger, but also more productive root ball to work with. Take a good look at your roots when you transplant, i believe there will be quite a few roots circling & some even choking eachother.
- Better aeration - the fabric allows air to enter the root zone from all surfaces of the container whereas with a plastic pot it is only from the top. The aeration provides a healthy environment for the roots by supporting the beneficial microorganisms and bacteria in your living soil mix that you put together. Oxygen is also necessary to diffuse carbon dioxide away from the roots caused by the respiration of root cells and microorganisms. The aeration also helps in keeping a cool temperature in your root zone, especially outdoors! I'm sure you've felt one of your pots before on a hot day, seriously hot huh? The roots are cooking in there and the living beneficial microbes are dying off, thus slowing down your nutrient uptake capabilities.
- Drainage - this is one benefit i knew you would like after reading about your almost daily watering schedule and your worry about being unsure if you are over watering. It's uncommon for growers in fabric pots to run into overwatering as you've got drainage from all sides and the added air flow allows your soil to dry out evenly. With less risk of overwatering you are also at less risk of root rot and root diseases.
There are probably a couple more benefits and maybe some flaws to fabric pots over plastic pots, but just looking at those few points i can't see why someone would choose to grow in plastic over fabric pots.
Happy growing Lion! i look forward to seeing some flowers showing up on your plants in the next few weeks.