Answers:
Prestige doesn't mean much at D3;
Probably, Athleticism & defense are big issues. Look at the top teams in your world and see whether their players have better overall Ath/Dec ratings. You've got to recruit that; not to the exclusion of all else, but the SIM will not be kind if you ignore it.
Not the gameplan, but why the hell are you starting Brown over Clark? Beller is your PG & Clark is your SG. Clark is probably still blue in PER, no? Otherwise, remember your guys still have poor IQs, make sure you are giving 20-25 minutes in both your O & D.
Oh, I just look ed at the Melville game. 15 of 30 from 3 point land should tell you that playing bad defensive guards in a 2-3 and telling them to sag back to help interior defense (-1) was a poor strategy. Otherwise, excepting your non-con scheduling fiasco, your doing fine.