Snap, I do almost everything with 15% and 1mm wire.Echoing comments above, you simply won’t notice any meaningful difference. I normally go for 15% for everything anyway. My machine has 1mm wire in it for ease and it’s happy welding 1mm plate using thin metal techniques. When this roll runs out I’ll go for a 0.8mm and a 1.2mm roll to give me coverage but I’ll still stick with 15% CO2 mix.