Check out inawera strawberry concentrate(truskawka)(2%) and molinberry strawberry(7%). Very little gunking and a flavor profile halfway between a natural sweet strawberry and some candy'ishness too. Actually it's reminicent of strawberry compote or jam probably the most. Both shake 'n vape. Not tried tfa or capella though... I've not tried FA either, but the inawera tino'd'milano is stated to be the same as the FA versions, maybe just slightly improved, they also are generally 1-2%, but there strawberry isn't bad at all, but has only a candy'ish note to me, and not the best type of candy either imho.
To me the shisha, clearly has a strawberry taste, but there's just something in there that bothers me, I dunno what. You can clearly smell what I mean, if you take some big whiffs from the bottle of concentrate, or atleast just imho
I've investigated pretty much in strawberry flavor's, since that is my sister's preffered vape(the only one she wants), and so wanted to find the best for her, but without it beeing to weak or gunky, and so I settled on the inawera truskawka. Maybe the mollinberry is very slightly better, I dunno, but I preffered the 2% against the 7%...