I think you overconditioned after your last PT. The overly soft frizz & looser curl pattern are classic symptoms of OC'ing, which would undo anything the PT did for you. If your hair didnt feel strawlike or too rough when you rinsed the gelatin out, you were probably fine I'd try it again, especially if your hair is fine, & be less afraid of it and go with a lighter conditioner as an RO after the PT.

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fine, thin, normal/(low?) porosity. Mod-CG. Usually I can't co-wash more than 1x a week, & sometimes I have to use T-Gel in rotation due to scalp issues.

Co-wash: VO5 Volumizing
Poo: Giovanni 50:50
RO:TN, Nexxus Youth Renewal, Alba Coconut
PT: gelatin PT, ION EC
Stylers: Giovanni mousse, TIGI Curls Rock amplifier (a-cone), Curls Rock Strong Hold Mousse
Gels: SCC spray gel