For normal Duels, I never use the "suggested" 9 enemy suggestions on the list. It either gives me way too hard people, or ones way too low point wise, I have to find the middle ground ones who give me max points I know I can win easily.
I go to the Heroes Ranking List and slowly start at 3AM and down the list, taking 3 attacks allowed per person. But I use the Steam desktop version and OFTEN get the 10 minute "Another login" timeout message when distracted with other things, then I lose my place on who I already attacked the MAX 3 times that day and have to find the person I had been attacking 1-2-3 hours before. Can you add a symbol (III) with red dashes through next to each name, showing us what names are done for the day, and what names I attacked only once or twice? Or just an "Attacks Left" column with a number? Thanks.