I use mostly Plagron products, have used both there All mix and light mix and coco fibers, also use there nutrients (specially like there Green Sensation)
have lookd at ther Bat Mix and have ask they guy at my hydro shop and he had only good things to say about it and did promise to get it home for me, will try it on my next run ..
should be kind a high in nutrients but since its a Organic soil mix and Organic nuts it shouldn't burn them small seedling..
but don't count to use much nuts doing Veg unless you Veg for +6 weeks, a bet would be to start at week 4-5 on 1/4 and move your way up on nuts and fist hit max Veg nuts them two fist week of flowering before you switch to bloom nuts .. just how I would do it with my normal 6 weeks Veg time (including the fist two weeks as seedling in cup`s)