Herrera for Men may be exactly what you're looking for.
It has some similarities to XS - and is definitely more musky.
Be very careful not to overspray for it is very strong with great longevity.
As a wildcard suggestion, perhaps you should also try Bulgari Pour Homme?
It does not smell like XS, but it is a uncluttered, fresh and timeless - and I find it very musky from top to bottom.