Sorry, don't know much about steroid shampoo or how it affects your hair. I ruined my hair by repeated box dying. Thought I was going to have to chop it all off, but have managed to greatly improve the condition by doing the following:
- Using SLS and silicone free shampoos and conditioners (I use House of Mistry) - Using the condition-wash-condition method - Taking a biotin supplement - Alternating monthly protein (Aphogee) and bonding (Colorphlex) treatments - Regular trims
I have found that analysing my hair's porosity has helped me to work out how better to care for it. Sounds like your hair is probably highly porous (most dry, damaged hair is), therefore taking on moisture but unable to retain it. If this is the case, protein and bonding treatments will help enormously.
You can Google how to test your hair's porosity, but the simplest way is probably just to put a clean, dry strand in a bowl of water. If it floats = low porosity, if it sinks = high porosity, stays suspended = balanced.