Stealing money for economy worked for me even though enemy kingdom were using 2 tpa for attackers too.
I play with 3 raw tpa, 15% TDs and boosted thievery science early to 70%. Means 6-7 mod tpa
And yeh we aint some random 20 province kd. Were 25m and weve won the last 7 wars in a row
Stats as avian when war starts: 95 mod opa (1 off spec/acre for dragon), 40 mod dpa elites out, ~6.5 mod tpa, 0.8-1 raw wpa
Edit. Starting opa is a bit low but the offense doesnt drop during war. It will go up when age goes forward and housing science gets up