hi and welcome to the planet
not used that setup but a quick google shows this
http://www.aspirecig.com/aspire-tanks/athos/athos473.html
A1 0.16ohm 85-100watt
A3 0.3ohm 60-75watt
A5 0.16ohm 100-120watt
why they have two coils with the same ohm i have no idea.
10ml a day is low to average for a sub tank. i get through 25-35ml a day in my crown tanks and only use 50-60watts
the higher the wattage the bigger the cloud but the more juice you will get through.
what wattage are you running the A5 at?
as this is quite a new tank im not sure if many have it so no idea taste wise between each coil. only way is try it and find out. just remember to keep between the wattage range for each coil.