Interesting strategy HK. I have and ally still 13th level not have gems unit that have 10lvl beast warren, 6lvl siege workshop, when I see his stat, his only few do map with 0.35k win 1 lose, 0.45k succeed raid 1 lose. Right now his kingdom got every beast from each level and his stat 2.3k/2.5k, very good strategy like you HK, " Do mostly PvP to build Eco and build A/D".
I will follow this strategy since I desperate looking bronze dragon from PvP
So I just upgrade my "pet shop" just to have dragon