Looked back at the replays I came up with the following changes (just to give you an idea, it can still be changed).
Acceleration Vial v1
- Level: 0 » 30
- Speed: 120 » 105%
- Time: 5000 » 2500 ms
- Ammo: 2/2 » 3/3
- Bounty: 2 » 10
Acceleration Vial v2
- Level: 25 » 60
- Speed: 120 » 110%
- Time: 5000 » 3000 ms
- Ammo: 3/3 » 4/4
- Bounty: 10 » 25
Acceleration Vial v3
- Level: 50 » 90
- Speed: 120 » 115%
- Time: 5000 » 3500 ms
- Ammo: 4/4 » 5/5
- Bounty: 20 » 50