@Gumbymom is the definite source on UC questions and I defer to her.
My understanding from asking this a previous year is that like with AP/IB (or honors if you are are in-state) they will only count DE classes from start of Sophomore year in any of the three GPA’s. You can still report all those DE courses taken sooner and they can be evaluated by admissions, they just won’t be part of the GPA.
If you haven’t already, you should use this site which helps summarize the rules and calculates UC GPAs.
https://rogerhub.com/gpa-calculator-uc/
This was somehwat discussed last year here:
In post #6, she says:
DE courses that are UC transferable get 1 extra honors point in the GPA calculation if taken the summer after 9th through the summer prior to 12th.