Kerry, thanks for trying that experiment even if the results were not what one would hope they might be. I think, if diabetics (like my neighbour who I am always trying to find these no-sugar chocolates for) would just start slowly trying unsweetened chocolate they would come to love it and to shun anything with a sweet taste. I know I started eating small bits of 70 and then 80 then 85 and then 95% and now find that 70% is way too sweet for my tastes.
I am not diabetic but I truly cannot stand the taste of any fake sweetener or even the natural 'lo carb' ones like stevia, etc.