Weird to see much lower levels on HoE than Suciadal

I suppose lot of people go on HoE to boost their perk, even if they die before the end, even if they make their team lose...
The graph is not showing the level but the %.
As an example, it means that on "Suicidal", there is 20% players with the Gunslinger perk.
It's nice to see some graph but there is some stuffs which you could "improve" :
- It's hard to really see the difference between each difficulty when you are comparing 4 graph at once...
- It's even harder when you don't have the same Scale : Up-to 30% on Hell on earth, 20% on the other difficulty.
Finally, not really surprised with firebug not being played that much. This is because Gunslinger can do the same job (good with trash and SC/FP), while being quicker, rely more on skill (headshot) and more fun to play. Also, less performance problem.