Overcharge shouldn't have a warning sound
As a survivor, if u repair a gen which has been kicked and hear the warning sound right off the bat u know it's gonna be overcharge. Overcharge skillcheck is quite easy to hit, so it's almost a wasted perk slot, at least in high ranks.
Comments
It's fine, and the placement is random for the skill check. Even if a survivor is extremely good at skill checks, they will never hit every single one, so if you patrol a major generator constantly and kick it, you get a lot of value out of it.
On top of this, not every survivor is even good at the skill check. Tier 3 is genuinely pretty hard to hit more than 3-4 times in a row.