Changing strings often has that effect, yes 🙂
Most Ukes are shipped with Aquila Nylgut strings and though there are some on which these work great, I am overall not a big fan of them. My first revelation were Worth strings which are also Fluorcarbons like the living water strings. Couldn’t believe the difference as it sounded like a whole new and better instrument. Generally Fluorcarbons result in a much brighter tone than the Nylgut ones which I think really compliments many Ukes. I have found that the size of the Uke also matters when choosing strings. I have two Enya tenors which came with D’addario strings. Most of these are made of Nylon and A LOT thicker in gauge and also warmer in tone. I love them on the Tenors but don’t on fretboards with more limited space like sopranos or concerts. Have fun experimenting =)