Lellow is someone you should definitely take advice from. His teams dominate in every league he is in. He's figured the Sim out and he is always happy to share insights, which is invaluable.
I've still yet to figure out what makes a quality QB, but the rest can easily be figured out why looking at powerhouse teams. Speed matters at every single position. I think it's a broken attribute but you need speed at LT, RT, DT, everywhere that common logic tells you that you can be slow you need to be fast. RB needs 80 or above or he's not worth putting back there. If your QB is slow he will ****.
Tank the season and build through the draft. Take best available and draft speed. Go to the community message boards and listen to what the greats have to say. Then.....game plan game plan game plan.