Just take a look at some of the last couple of players on the Big Board, it will tell you exactly what kind of ratings it takes to get a player on there. The players are judged based on their attributes alone, a teams success has no bearing on their draft stock. Compare the draft big board at the beginning of the season to the end of the season. If team success played any factor you would see wild swings in player's positionings. Instead you see underclassmen and JR's climbing up the list as they continue to improve, and SR's stagnate or drop, as many have already reached their max potential.
No offense but none of your players are even sniffing the list at this point. It's easy to say you need better players to have them get on the list, but for now focus on how you can accomplish this. As a low BCS school you need to load up on decent non-conference wins to raise your prestige up to the B range. Once your prestige is here, you can start to recruit the guys good enough to make the Big Board. Not saying you can't recruit a player who makes the BB with a C prestige, but these are usually special cases of guys with massive potential. There's nothing wrong with scheduling a bunch of SIMS in non-conference and going an easy 10-0, especially in your situation. But if you're going to do it, schedule them on the road. No reason to ever play a SIM team at home