I would stay away from products with silicone in it. It dries out the hair even more!
I use Eqyss products they are GREAT!!!! for the mane and tail just start using Avacado mist each day. I also use pure Coconut Oil that has made a world of difference as well.
For the mane I use thinning shears! you dont have to go through the hassle of pulling the mane and making your fingers hurt and your horse get mroe annoyed! its quick and simple and leaves the mane looking show ready..or if your not showing you can leave it a bit longer.
Before picture (mane)
After using the thinning shears