B4 Shock length help

[Rick-J]

I have a second hand B4. It's going well but I struggle over humps and jumps. It never lands well (Could be my driving). I was looking at the car and it looks like it does not have much front droop. Cant find the info anywhere but what length should the front shocks be to get the correct droop. Would more droop help it land better? Blue springs inner hole on wishbones and middle on tower. Thanks