Each time I want to use Nose down (especially in anti grav tunnel) the game just throttle the boost.

I checked my settings, I use arrow keys for nose commands (and IJKL) as alternate command.

My boost is on Shift....

Whenever I press UP arrow or I key, the boost start to charge, thus preventing me to nose dive :/

Any help appreciated

The boost only works when you're nose diving. So it's natural that it charges when you do. It doesn't prevent you from doing it, normally.

The thing is, when I want to nose dive (in anti grav section mostly to avoid rocks) it won't dive at all, so I must either roll right left and hope it will do, or use nose up and roll to get myself in the good way. Most of the time anyway, Even with roll I end up smashing into rocks...

I don't remember having such hard time when I played back on my win98 some decades ago :/

up

Nose up or down doesn't really have that huge impact at least for me going left or right I can go from side to side in the tunnel but going up or down I can maybe use total of 1/3 of the tunnel.

Using left or right makes your pod turn but that can be countered with roll.

How far are you into the game because later tracks depend on nose up and down to either clear gaps or go into them.

There is one HUGE pain in the ass where you have to dive into a hole and the only way I've ever managed to do it without going over the whole and into the wall is to slow way down and put my nose down.

Just got this and I'm having the same issue :/ I can never get first on the vengeance map because I can't maneuver around anything. I just crash and burn and hope I can catch up

This is an issue with the framerate being too high (which changes game physics / behaviour).

There's other threads about this issue on this forum.