Those droopy looking leafs in addition to the yellowing and rusty patches on the lower fans would indicate too much water or watering too often, among other issues and possibilities, such as, not enough watering. contrary I know, but thats how it goes with plants.
If I were you I would look around the web for pictures of overwatering and watering too often and compare the results to your plants and make up your mind. then look up under watering and do the same. GWE has a very good diagnostics page for instance.
i noticed you were mentioning "run off" earlier in the thread, one thing I have noticed about grow bags is that they allow a large amount of water to run out of the bags before the soil/medium has enough time to soak up the liquid, you might keep this in mind when watering.
A slow drip feed system or just pouring a small amount of water ( every 10 seconds or so) on top of the soil and allow it to soak in and down the middle of the pot will allow you to water the whole soil/medium/pot more evenly and give you a better idea of how much water the pot will acually hold before the run off is real and not just water pouring out of the sides of the bags.
Watering issues are often similar in the look of the plant so difficult to judge without being on site.