I am starting to think that the same mmr is tied to all 3 of your roles. It is quite interesting to win a few games on a higher sr role of yours in a row. Swap to a lower sr role of yours by as many as 700 SR and you feel like you are facing the same skill level and getting just curbstomped by other “bronzers”
If I am playing tank at 2100 comfortably and feel like the speed of the game is practically the same in high bronze something just isn’t right.