A few possibilities:

Too much and/or an oil that your hair didn't like (I'm assuming you dissolved gelatin in hot water and then added the water and citric acid?). I do use a heavy oil in my PT (coconut), but it's a small amount mixed with a bunch of other stuff.

Do you normally see better curls with protein? I know a few ladies who are unable to do protein treatments because the concentrated dose of protein actually makes their hair soft and straight, rather than the typical over-proteined brittle straw feeling. This might be something to play around with a little bit.

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3a/f/iii
Modified CG since 11/5/11
CLEANSE: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo, CHS Treatment Shampoo
RO: DevaCare One Condition, SS Caitlin's Conditioner, Mop Top Daily Conditioner
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier and Strong Hold Mousse, Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel