You might try an ACV (apple cider vinegar) rinse as you might be overconditioned. If that doesn't help, your hair might just need lots of moisture and deep treatments would help. I know Boots is a leave-in, but you may want to try leaving in a bit of your conditioner and skip the Boots and see if that helps.
My hair needs lots of moisture and I have to either leave in alot of my conditioner or use lots of a leave-in. Except for Boots, I've never used the other two products you mentioned, but hopefully someone else can comment on them.
Oh, and don't worry about the questions - that's what this site is all about