django storages and setting ACL per object

I am using django-storages and google-cloud-storage backend.

what I currently have is the following.

from django.conf import settings
from storages.backends.gcloud import GoogleCloudStorage
from storages.utils import clean_name
from django.conf import settings

class PublicImageUploadStorage(GoogleCloudStorage):
    bucket_name = settings.IMAGES_BUCKET_NAME or None
    file_overwrite = settings.IMAGES_OVERWRITE or True

    def make_public(self, name):
        name = self._normalize_name(clean_name(name))
        blob = self._get_blob(self._encode_name(name))
        return blob.make_public()

this is slow because it looks up blob object by name then return it so I can make it public.

what is the most efficient way of setting object ACL to be public-read before saving the object to google storage ?