Swap out one of the Renegades for 2 Researchers and a Gamma Bomb (nerds gotta have their tech) and you have your theme requirements.

If you don't mind being cheesy, the best way to fix it would be to split the 300pt Superman into 2 of the 150pt Supermen. This gives you your 6 figures needed, plus it gives you two solid attackers instead of the one. 300pt Supes is nice but I don't think him and Chuck could do it alone.

What makes the scientist keyword so great is the amount of variety in support pieces.

Enhancement: researchers, Hydra Techs, AIM Renegades, Dominators

Support: Dr. Midnite, Hydra and AIM Medics, AIM Agents, Hank Pym, The Chief

Outwit: Tony Stark, Mole man, Bruce Banner, Howard Stark, AIM Renegade, Dr. Octopus, Batman

Perplex: Lucius Fox, AIM Agents, Hydra Techs, lots more

Also you have guys like Cave Carson who are cheap taxis and other figures with TK like Dr. Alchemy.