Well Prof. to be honest i have the same problem as you.. used to have 22-23% def ratio, last week had huge drop and this week is only 15%.. i don t think is the video sharing.. maybe energy talisman abuse help attacks or the nerf of some key toons that helped before (nbol / MCR / wrath) ..
Anyway we all have high attacks ratio (from 89 to 97 %) , al least the players in top 50 so playing in high rank we can t expect much from our hold but a few times bad rng happen and thats all we can expect xD. yesterday for example i lost 3 times in a row against ringe's team which is very similar to your new setup.. only matter of luck/bad rng/coin toss sometimes..