I've read harder hold gels are a must in the summer to help prevent frizz when the dews are high. So it might be a two fold problem of glycerin + not enough hold. And since you're fine haired you don't have to be too afraid of protein so you have a wider selection, don't you? I've tried AIF and it's pretty hard. Too hard for me in an arid climate but I bet it would keep your curls intact in a more humid one.
3A - C, HP, ME, HD. (Coarse, High Porosity, Medium Elasticity, High Density.)

CG since Nov. 2012

Poos: SM Moisture Retention + Yucca Baobab, TJ's Tea Tree Tingle
Condish: TJ 'sTea Tree Tingle*, SM Moisture Retention* + Curl & Shine + Yucca Baobab, Yes to Blueberries
Stylers: KCKT*, SM Curl Enhancing Smoothie* + Curl & Style Milk*, KCCC*, FSG*, CJ Pattern Pusha, Curl Keeper
Sealers: Jojoba* or Grapeseed* oil

* = HG