I noticed END stats is really important and i started a new game recently aiming to develop the full potential with this stat. But at level 2 i cannot improve the endurance potential stat by any way... I'm currently at 70-75, which i find quite low ...
There is a way to improve this potential whitout database edition ? Maybe after some level i'll have the option to upgrade the END potential ?
Sadly, you can never increase the potential of your End, Res and Dhi on your levelup. And even if you can, you won't gain much since their initial potential values are pretty high.
At this point you have to download an editor, I personally use Lachi Editor. Its evident that Cyanide didn't work on Pro Cyclist mode for this edition that's why you'll see your Climbers and Time Trialist have poor Endurance and better Resistance even though they change how these attributes work. What I do after I create a new pro cyclist is to swap the initial and potential attributes for End and Res using Lachi editor.
It's actually pretty easy to use, you just have to extract the .cdb file of your saved game which is located Roaming>Cloud. Select Dyn_Cyclist at the dropdown menu, locate your rider, then swap the starting and limit value for End and Res. Then export the file overwriting the .cdb file of your saved game. Don't forget to
make backup saves.
Another way to circumvent the issue is to increase the variance of your Race Day Condition. A positive RDC such as +5 gives massive boosts to End.