The products you use contain loads of humectants and no protein at all. Maybe your styling products do, but you did not mention which you are using.
If you are medium for both texture and porosity, you may need some protein. You mention that your hair cannot seem to soak up moisure. What makes you say so? What do you experience?
You also mention that you did not like the protein treatment. What treatment did you use exactly? How long did you leave it on? And how did your hair feel afterwards?
That depends on your hair properties. Someone with fine hair mainly needs protein to achieve good results.
The sHegron Aloe Vera Conditioner is a pharmacy product too, but it does not contain harsh ingredients. You should not judge a book by its cover and dismiss the gliss kur conditioner just because it is sold in a pharmacy. If Firefox recommends it, I bet it does not contain any harmful ingredients.
I found the ingredient list for you:
Aqua, Cetearyl Alcohol, Hydrolyzed Collagen, Panthenol, Cocodimonium Hydroxypropyl Hydrolyzed Keratin, Hydrolyzed Keratin, Isopropyl Myristate, Behenoyl PG-Trimonium Chloride, Citric Acid, VP/VA Copolymer,Phenoxyethanol, Behentrimonium Chloride, Sodium Methylparaben, Hexylene Glycol,Parfum, Polyquaternium-37,Dicaprylyl Carbonate, Hexyl Cinnamal, Amyl Cinnamal, Limonene, Linalool, Benzyl Salicylate
Unless polyquats give you build up, I would give it a try.