Glad to hear that you are making progress. Don’t worry. Once you get started, it will become easier.
Bhavanga is associated with one bhava, for example, as long as one’s rebirths are within the “human bhava” all rebirths within that human bhava (i.e., human jati) will have the same bhavanga.
- At the end of that human bhava (which may last many thousands of years) one may grasp a different bhava (Deva, Brahma, animal, etc) and then the bhavanga will switch to match that bhava. If the new one is a Deva bhava, that will have a bhavanga appropriate for the Deva bhava.
- See “Bhava and Jāti – States of Existence and Births Therein” and “Bhava and Bhavaṅga – Simply Explained!
Please feel free to ask questions if the above two posts don’t have the answers to your questions. It is important to resolve these issues before proceeding further.