Well, IF I was still being in FE or OF (or at least below Space Age!), then I also could probably win more enc in GE5 with a lower att/def for DA !
I do not know what you both are planning to do : staying forever camping in your current Age? (bah, boring, not? LOL )
If so, good for you not to need way more boost immediately ...
But if you ever reach SAM (and higher), be well-prepaired !!
If I was you I would start building SBC and/or DC : you will need way more boost, especially attack is hard to get since so far no attacker potions for DA excist nor a Friends Tavern attack boost (sadly) and special buildings often have most of the time defense boost rather than attack boost. But, of course, it's all up to you.
Plus Inno is sure giving us in the future more Event buildings that also give attack boost for DA .. question is : can players get those buildings with rewarding events (= investing time and effort in event to get it!)
or do they need to pay for measly events (?) where investing time and effort do NOT reward the player as should be!
For example : I did so far each day the Daily Challenge choosing the Key Pieces for the Calender to "try" to maximize my chance to get this Calender complete, but I will certainly fail ! So even trying hard (time and effort!), the event do not reward me like should be .