If i can kill a 36k Bio plus his surgeon general as support with practically only my valentine (a support character) i think it will be no problem for i dunno parasoul,double,cerebella, etc.
Here is the video if you wanna see
If your best diamond is a peashooter dont wonder why you cannot pass trought boss node, you only need to get stronger variants.
I dont see necesary any nerf, in fact, there is a lot of cards that need tweaks in their SA to be more relevant.