My experience with MG soil and nutes(they can grow some HUGE buds, however my current headstash doesn't utilize MG) is that you want to flush HEAVY, HEAVY for 2-3 days. The time release you can't really do anything with, but you can flush the hell out of them as they release the last of their nutes. 1.5-2 week flush. They will yellow and wither from over-watering, but than is a sign of decreased nutrient uptake. The downside is you need a longer drying period because you soaked them right before you chopped.