heavy soil

Hi! I am new in this lovely site, so feel free to move this topic if required... Also, I'm from Argentina so please be patient with my English xD. I am going to start my third grow some weeks from now and I want to change my nutrients/soil plan (I don't like the nutrients brand I'm using...

So while my soil is far from a true super soil, its a pretty good mix of fertalizers such as agricolas high octane mix, 2 types of local compost, perlite, bumber crop soil builder, and this potting soil mixture http://coastofmaine.com/product/stonington/, that i only now see is formulated for...