It sounds like you are coming off the jump wide throttle and with that the nose is pointed towards the moon, this will by far make it less responsive when hitting the break, second, adjust your front break alittle, when you hit the breaks in the air your wheels should come to a stop, the faster they stop the faster your nose will come down, but you are going to have more stopping power on the ground as well so you will have to account for that.,
Its just something that you will have to figure out but setting up and PRACTICING