try to flush the soil as good as possable. with the amount of ferts you are using it is definatly overfert. let me get this straight...the soil has ferts. then you put bone meal, which i'm assuming has phospherous in it, and followed up with MG 15-30-15 and another fert with 2-0-2...is that right?

well, i usually (outdoors) use top soil from home depo mixed with sand, vermiculite, perlite, and maybe some coco fiber. so far no nutrents in the soil. then, i get some shultz 20-20-20 and some advanced nutes b-52 2-1-4 plus vitiamins; thats it until it gets close to flowering. then i swich to a good bloom fert maybe 10-20-20 or even 15-60-15 if the plants can take it, and keep the b-52 also.

if you can transplant them into some less toxic soil you may be able to save them.
good luck, and keep us posted!