That would explain the sweetness.
Although I haven't tried Ardbeg Uigeadal, I have tried a similar expression...Lagavulin 16? Very smooth and sherry sweet with a smokey nose.
Has anyone heard about a new Glenmorangie with a Burgundy wood finish? It should be out in May.
FYI, If anyone is looking for a great lowland dram with sherry, there is one of my favorites lurking around. Auchentoshan Three Wood is outstanding- ten years in bourbon wood, a year in Oloroso, and six months in Pedro Ximinez. It has a hint of smoke, and is not like most other Lowlander's (It's heavy and smooth).