First off, Ello!
Second: TPE and silicone both require powdering as often as they begin to feel tacky. Thats just the nature of these materials. How often that is depends entirely on how naked you keep her. for example I powder Maddie about once every couple of months, but she is generally fully clothed all the time, so she doesnt need it more often.
I've had her 2 hears, I've oiled her all over once, and that was more for a deep cleaning than because she needed oil adding.
cant really help you on lighter weight dolls, bit others will be able to advise on whats out there and available.
"Storage" for my girls are the beds in the house, they dont go in boxes or get hidden away. They just laze about on the beds all day.
K