Vaseline and baby oil will dry you out more never use products with a mineral oil (Petroleum base) - especially with dry skin. That goes for cheap creams too.
Try eating more protein - (meat, chicken, fish, peanut butter)
and take some vitamin e orally + up your water -
I love the new cocoa butter (gel) made by the brand Vaseline it's pure and natural and seals in moisture in the shower. Try using it with a lufa or one of those puffs it should help a lot.