Not really sure why you're not playing Martens. He's not great, but he'd be a serviceable backup PG. Plus he's got the most ATH of anyone on your team, which can be a key core.
Weismiller is bad. I wouldn't worry about him complaining. If he doesn't leave in the off season I'd cut him.
I'm not a fan of Derrick's ATH, DEF, and STAM. Those three together are lethal combo to be lacking in, especially in man to man defense. The rest of his cores aren't bad, so maybe you can overlook those spots for the others.
To be a good program year in and year out, IMO you need ATH, DEF, and STAM. Focus in on those and look for high potentials in other key areas and you should be able to build a successful program.