Tested - Best hair products for thin limp hair

I used to have thick healthy head of hair before I moved to Dubai. So thick that my hair dresser used to complain that she had to work extra hard just to blow dry my hair! Fast forward 10 years later, I am left with half of what I used to have. Don't get me wrong, I am not turning Kojak anytime soon, as hair is still 'sprouting' on my head as I type here but the hard water that Dubai is famous of is steadily doing its job to making my hair thinner faster than the new hair is growing. Yes, hair fall is a common problem in Dubai. Everywhere you'll hear the moan and groan of the expats (especially the new ones) as they realized that their hair is thinning and their horror as the plumber pulled out a hand full of hair from the drain! (Yes, I almost fainted)
My hair is naturally coarse, straight, dark and heavy. It tolerates heat very well and resistant to coloring. It tends to get flat especially when it is kept long and styling products rarely work on it. Having a flat thick hair is one thing but thin flat hair is another story. Along the way, through trial and error, I realized that too much product will not help my hair getting fluffier but flatter instead. The style plays an important role as well. My hair would look fuller and lighter in shorter cut and a shorter side fringe helps making the top a little bouncier. 
Here is my sworn by products that proved to work (at least on me!) :

This shampoo by Keihl's is on the pricey side but rather than try something that might not work, I'd rather spend some money on something that does. It is light and leaves hair feeling 'bare' and clean. So light that you can use it daily if you want. 

This conditioner also by Keihl's is so light weight but still, I don't use it everyday and only at the end of the hair shaft, never on the scalp. This conditioner gives all the nutrients the hair needed without adding the weight.

Now, this is where the magic is. We tend to over styling our hair and use too much product that leaves our hair coated with residue resulting to dull lifeless hair. Shampooing once a week with this anti-residue shampoo allows it to strip our hair from the unwanted including chlorine if you are a swimmer and get our hair ready for all the nutrients our regular shampoo and conditioner have.

For texturing, I use this product by John Master. This organic sea salt and lavender spray adds volume, texture and perfect to revive a day old hair. It is better than dry shampoo in my opinion as it leaves no residue and the lavender fragrance is delicious! Remember though, less is more.  Use sparingly and you will see the good result!
What is your go to hair product? Do you have any tips for thin and flat hair?