Can you change starting line bite with tire pressure?

Of course.

It changes the spring rate at the contact patch too.

Add air to take out bite and let down to add bite. right

Lower pressure less bite.

For best results, ALWAYS run the most tire pressure you can, while maintaining the full contact patch.

With that said, simply take small steps in finding the "correct" pressure for your needs.

Check your pressure cold, and immediately after your first run.

Having to lower tire pressure to get "bite" is usually a sign of something amiss in the suspension package.