To be off by 1 full degree sounds like something is bent. For sure start by checking the pins. If they are all straight, I'd suggest getting new rear hubs. Sometimes in hard or repeated hits, the plastic can bend or twist causing the toe to be off. I've had this once and I was scrambling for like an hour at the track until someone told me they had a hub twist before. Soon as I swapped hubs everything was straight again.
You could check this without even buying anything by swapping your hubs left to right and re-checking toe.
Blocks could be misaligned in the chassis but I've never seen them be off that far. That is also something worth trying tho.