questions that you asked:
1. Does Tucking Hair in promote faster growth?
Strictly speaking, no, protecting the hair ends by tucking them in or bunning them does not affect the follicle where the hair grows from. What it does do is help preserve the hair by protecting it from damage in the form of sunlight which degrades the protein in hair and physical wear such as damage from rubbing against clothes. The longer you can keep the ends, the longer your hair will be.
2. Is a creamy leave in better than a liquid one?
I have to go all scientific on this one and say.............experiment!
1. If you are really serious about getting to grips with your hair's likes and dislikes, starting reading the first 5 ingredients of the products that you buy.
2. Try layering products - use a creamy leave in and then add oil on top. You can even try double or triple layers using less product to avoid your hair getting weighed down too heavily.
3. Be adventurous - try mineral oil...............yes mineral oil/vaseline/dax pomade. It is a better 'sealant' than many natural oils. Let me repeat that in bold - mineral oil prevents water evaporating from hair much better than most natural oils. I know that you know that I generally do not recommend mineral oil because I prefer natural oils but I need to set the record straight mineral oil as far as maintaining water inside your hair is supreme. If you are struggling with keeping dryness at bay and have no qualms with mineral oil - try it it may work for you.
My top note on moisture is that it is not about adding water into hair, it is about creating a humid environment outside the hair shaft that keeps the water in the hair shaft
Extra reading -
Mineral oil and what it can do for you
Moisture bumper series - see the role of water, oils, proteins and humectants in keeping in moisture.