Well first off a lot of people dont use organic soils. Personally I use Promix HP Because it has absolutely Zero Nutes in it. All the nutes my plants get they get when I feed them, it gives me much more control over what I feed my plants.
Where did you buy your OD from? 120 for a gallon is expensive. I pay about $20/L
I dont think more is better, I dont know many people that do. Its not about "more" its more about the quality of products that you are feeding your plants when you do.
I swear by using Big Bud then OD and I wouldnt grow without it. I know a lot of other growers who are the same way. You cant really find any other products that are as good as Big bud and OD without spending a Ton of money on ridiculous products.
If you can ever find anything that has the same chemical composition as Big bud or OD for cheaper then Let me know because I would be happy to use it, but untill then its BB then OD all the way.