I've found thinner gels tend to give me smaller clumps. I've had good results getting thinner clumps with Biotera Gel, GVP Liquid Sculpting Gel, AG Curl Liquid Effects Gel, and Curly Sexy Hair Liquid Curling Gel (all CG), as well as Ouidad Climate Control Gel (not CG). If you're not strict CG, I've also heard some people anecdotally say that silicone styling products also seem to give them thinner clumps. Since I pretty much always use thin gels now I can't really say if I see a difference with silicones or not.

Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel