Front shock question

Sorry for the potentially ignorant question. But, I have a Prime with front shocks. I weigh ~87kg. I have ~160psi in the shocks. (I read on this forum (I think) that 140-160psi was correct for >80kg weight).

If I open the shocks at all (even 1 click from the locked out position), they seem to sag too much. When going downhill & braking, they sag so much that the fat tire rubs against the front of the battery case - VERY loudly.

Do I just need to keep adding more air? I assume there is a max pressure I can add and I don't want to damage them, but I need to reduce the sag or the shocks are totally useless to me.

Advice?