It is because skin effects and demanding abilities cast in game, like Kunka aghs.

Hopefully they show total matches somewhere

Man…I Haven’t see a visage for a while in my games. Looks like ima find one soon

Something similar happened to me after playing with a herald friend. Not sure if it was a coincidence or been flagged for something but i was having terrible games with toxic teammates and was not winning our lanes in most of the matches. Lost around 250MMR but I recovered my MMR with recalibration. In fact gained over 400 till now. Matches seem to be normal as well.

Try recalibration if you can. In case you are flagged for something this should help

Making him less tanky is fine as well i guess…he is way too tanky for the mobility and the utility he has