Do you think it could be that the weight of your hair, now that it is longer, is pulling the curls down and so making them look more wavy and less curly? If this is the case, and you want to keep the length but also get your curls back to 3C, you could try adding more layers to your hair.

Also, this time of year many folks notice limper curls due to winter dryness and low dewpoints. Do you think that could be affecting you? Maybe try doing a deep condish?
Medium/coarse, low porosity, dense, mix of 3s
CG (again) since Nov. 2012

Cleanse: SM Moisture Retention, Elucence MBC, KC Come Clean
Condish: Giovanni DL, Cure Care, Ion Treatment, GVP Balm, AOHR
Stylers: KCCC, SM Souffle, AOMM, SS CEJ, JCRR, JCCC

Trying out steaming!