We don’t like our sweets very sweet in our house so most of my recipes have minimal sugar. If you find these aren’t sweet enough for you, you can always add about 50 grams of rapadura sugar with the rest of the ingredients prior to mixing.
I love my oven but do find it usually takes longer than recipes say to cook things. I’d check the cookies at the 15 minute mark and take them out if done. A few minutes is all it takes to go from undercooked to perfect to overcooked!