I use Miracle Grow Moisture Control and I've had VERY few problems.
The trick with seedlings is that you have to flush the soil with water before you put seedlings in it. Most soils that come with nutes are too "hot" for babies; a good flush will fix this.
Also, if you get some gardening Lime (it's pulverized Lime that you can buy at Lowes for just 3 or 4 dollars) This will "buffer" the soil so that it isn't so sensitive to PH levels. Add 2 TBSP to your bag of soil and adjust your PH to 7.0. That simple, really.