Your farm probably sucks and you aren't shutting down the heroes you need to shut down with team coordination enough.
If you aren't winning you clearly are not applying what you've skimmed through. Watch some top MMR Storm games, go through Juice's replay pack as he stomps 3-4k with Storm.
I was actually talking to someone about it. I've noticed I do better on Storm when I'm stacked with 4-5 people. This is because the hero is so damn team reliant early and can only really pick of squishies solo. I farm well, and usually gank, but then they have some silence or doom or something that shuts me down most of the time. With coordination I usually do better.