I have used Tress FX and had the same thing happen to me too. And with other liquidy gels such as B&A Gel and Yanai Van Soft Hold Gel I experienced the same thing.
I just chalked it up to my hair really not liking liquidy gels at all. Because in addition to them causing flakes they would also pull out my curl too.
One thing that you can possibly do to keep the product from flaking up on you is to first apply a hydrating leave-in moisturizer(a moisturizing base) and then apply your liquid gel over it.
Products in my current regime: Nioxin Scalp Therapy Shampoo, ORS Replenishing Pak, Curls Whipped Cream, Curls Souffle, Curls Spiral Curls Cream, Curls Milkshake, Curls Quenched, BB(Bonner Brothers) Growth Lotion