Suggested

Set a max DRS/KERS level

My suggestion is to add an option to set a max level for DRS/KERS in the league. When ALL managers have maxed out DRS/KERS, races become boring, because a massive drs train is formed during the race. Due to this train, the strategy becomes useless, as in the final stage of the race, everybody will end up in this endless DRS train.
In order to fix this, i suggest to add this option.
EX: If the league owner sets lvl fourteen as the max DRS/KERS of the league , even tho i have a lvl twenty drs,  all managers will have  a lvl fourteen DRS/KERSduring the race.

I agree, DRS is waay too powerful 

I can't see how that would change things for the better if all teams still have the same level of technology.

DRS is way too powerful and I agree, but we have a basic problem here with it.
I would just remove it and add slipstream effect to the game and would also remove the current kers system. Kers should last just a little bit and recharge every lap or we should just have a number of "push to pass" to use during the race, so we'd need to learn how to use it in the right moment to attack or defend and don't get it wasted.
Current DRS and KERS systems are no fun.

But what difference would that make? Eveetone being level 20 or everyone being level 14 is still the same level so doesn't really impact anything 

Need different levels in the league to have lots of mini trains :D 

DRS and Boost part of the car design.
If you're level 13 you will start with 13 point design if you are level 20 you will start with 20 point design. 

They could set design limits.
DRS, Cooling & Reliability to 50 point designs
Boost, Fuel & Tyres to 100 point designs
Acceleration, Downforce & Handling to 150 point designs

Braking should be a supplier level stat that can't be worked on.
If you want to make your braking better add more Downforce to the car setup or add Braking as a driver ability stat to add an extra 20 points to the braking stat. LOL

I've never seen nothing like this...

Look guys if y'all use only one kind of strategy for the race there'll be a train at the end and whoever has the best position and the most KERS will always win. Try another strategy, analyse the grid see what you can do so you can break this "league curse" that you guys are having. There's no need to change KERS nor DRS, at least, not for that reason.

Not saying "oh my god, I'm better then you" but it's possible to win a race with fewer KERS at the end just by building a big gap at the end via strategy, I've done it so many times that I can't even remember. I've raced a lot of races in my many accounts in game, since 2017, and I've never had problems with lv.20 accounts, not even when I was lv.15.

I've never seen this complain before.