@phred, you are absolutely right - whether or not you add 5%-10% water, malt must be drunk at room temp, NO ICE!!
Ice is ok in a blended whisky, if you must!
FYI, when I was at college I worked as a barman in the "Circle Bar" in Edinburgh's Cafe Royal, so called because the ancient wooden bar formed a complete circle behind which the barmen used to shelter when fights broke out lol (a bit like the wagon train circle when the Indians were attacking!!)
Anyway, the oldsters used to order a nip or glass of "The Famous Grouse" (a great blend) with 10% lemonade (aka Seven Up). But to show you how mean (aka thrifty - tight as a duck's bottom) these local Jocks were, they ordered it neet, paid for it, then asked us to add a little lemonade for free (otherwise it would have cost them an extra penny!). It was a pretty rough bar in those days, so I always did as asked - I valued my front teeth LOL
Anyway I tried it, and you know - it works!!