Some relevant literature that may aid in your experimental setup and discussion. I'll keep my eyes peeled, more to come in the future:

Terpenoid influence on Reproduction: [VERY relevant]
Karr, L., Coats, J.R. (1992). Effects of Four Monoterpenoids on Growth and Reproduction of the German Cockroach (Blattodea: Blattellidae). Journal of Economic Entomology; 85(2), 424-429.

Effects of dietary Protein on reproduction:
Hamilton, R., Schal, C. (1988). Effects of Dietary Protein Levels on Reproduction and Food Consumption in the German Cockroach (Dictyoptera: Blattellidae). Annals of the Entomological Society of America; 81(6), 969-976.


Not as relevant, but the following discuss effects of humidity and density dependence on mealworm growth. May be applied to other insects:


Mellanby, K. (1932). The Effects of Atmospheric Humidity on the Metabolism of the Fasting Mealworm (Tenebrio molitor L., Coleoptera). Proceedings of the Royal Society of London, 111(772), 376-390.


Weaver, D., McFarlane, J. (1990). The effect of larval density on growth and development of Tenebrio molitor. Journal of Insect Physiology; 36(7), 531-536.