I've had this issue in all 4 races now. There were 3 DRS trains in Race one except the redbulls who were clear ahead so they didn't get caught up.
In the second race there were 2 DRS trains. By Australia I started really noticing the issue. If there is a train of more than 3 cars what happens is the 2 lead cars battle it lap after lap whilst the rest just sit behind at a certain speed. I think someone noted it before I think its because the AI are deploying the battery exactly the same way so there is no variation. That and the AI seemingly don't get affected by dirty air I had Leclerc behind me for 20 laps yet his tyres were in better condition than mine and I had been running in free air in a mclaren.
I also noticed the AI ha e OP traction in damp conditions when trying to set a lap while it was raining the inters were too slow but all the AI had perfect traction out of corners whilst I was dancing amd fighting the steering wheel like it was a tango dance.
I hope this gets fixed because until it is I can't see the enjoyment of racing. I'm actually getting use to the handling it's the DRS trains and over the top ERS deployment that is making it annoying. I think the recharge is way to quick.
I swear there is something in the regulations that says you can deploy 2MJ per lap but only harvest 1MJ so if you drain the battery you shouldn't be able to recharge it in one lap.
Increase ers variability to the AI, buff the dirty air affect on AI and also nerf the battery recharge rate and I think you'll fix the majority of the issues.