Glenfarclas Sherry bombs 105 proof and 15yo?

I recently bought the 105 Cask Strength and for a highland sherry bomb it's great - even at Finnish prices. But it's kind of a difficult drink: at cask strength it is amazing but I can only tolerate it in tiny amounts - this bottle will last me a year. Adding water changes the character so much and dilutes the intensity so much that I'd rather drink 1cl undiluted that the more typical 4cl pour with water. This is not a moreish whisky undiluted but I still like it much more undiluted.

But we also have the 15yo at roughly the same price (a bit more but not prohibitively). That's available at a 46% abv rather than 60% which sounds much more palatable but also more intense than the 40% that most whiskies are available. So how is the 15yo? Also a sherry bomb but a more moreish one than the 105 proof? If I like the flavours and intensity of the 105 might that be a good bottle for when I don't want a punch in the face but do want similar flavours?
 
Location
London
I actually haven't tried any of the GD Cask Strength... but I love the regular bottlings (esp 15 and 21yo). I like Tamdhu Batch Strength and Aberlour A'Bunadh, although some say the quality of the latter declines with each release.
 
I actually haven't tried any of the GD Cask Strength... but I love the regular bottlings (esp 15 and 21yo). I like Tamdhu Batch Strength and Aberlour A'Bunadh, although some say the quality of the latter declines with each release.
Unfortunately we don't have the Tamdhu or Aberlour. Or the 15 and 21 Glendronach. We only have the 12yo and Batch 9 cask strength Glendronachs.
 
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