Starlink's Satellite Internet is a completely different thing that other Satellite Internet Service.
Other Satellite Internet provides have one large satellite that is in "geo-synchronous" orbit. This means it always appears to be at the same place in the sky above the earth. That's why you have to point your Dish antenna to the Southwest. It is also why, in some regions, the satellite can be "too low" (i.e., near or even below the horizon).
Starlink, however has several thousand satellites. As of this moment, 5,601 according to https://www.starlinkmap.org/. This Starlink Map is provided by SpaceX/Starlink themselves. As you can see all 5601 of these satellites are constantly moving.
So, wherever you set up starlink, you need a fairly broad view of the overhead sky so that it can detect satellites entering your visibility before the one you are currently connected to goes out of visibiilty. The hand-off from one satellite to the next is automatic and invisible to you.
ALl that being said, 12% - 13% obstruction *MIGHT* be enough to get good service... generally, teh lower the obstruction %-age, the better. I'm assuming you probably do not want to cut down any redwoods, so moving your Starlink antenna higher off the ground. Of couse, after a while, this can get challenging. You might want to seek out a Starlink installation service for assistance.