if you are going to install a bigger cam, you always want to increase the compression ,so you will @ least have the same cranking compression as before.
This is very important.
However, it's frequently just not possible to completely recover the lost low-speed power by raising the static CR, unless you increase the cranking pressure quite a bit.
Just an exaggerated example: a 250 with 9:1 static CR and conservative 55° intake valve closing (at 14.7 psi ATM) will show about 154 psi on a gauge, producing perhaps 245 ft/lbs. of torque at 1,000 RPM (47 hp).
If the intake closing is delayed to 75° (quite a bit), the pressure falls to about 125, only 169 ft/lbs. of torque at 1,000 RPM .
Raising the static CR to 10.6:1 brings it back up to 154 psi, so that's fixed, right?
Nope.
The same cranking pressure is acting on a "smaller" cylinder due to the shorter effective stroke at the new closing point, and only making 204 ft/lbs., still much less than the stock engine.
To get the same torque at 1,000 RPM, the static CR would need to rise to 12.4:1, with 188 psi gauge pressure.
Yes, it's complicated
