This keeps the trip at exactly 3 days and balances the driving much more evenly: roughly 7–7.5 hours per day before normal fuel/food/restroom breaks.
A very fast 3-day drive from Whidbey Island to San Diego — doable, but it’s a serious west-coast haul, so I’d keep stops simple and sleep at Hilton-family hotels along the way.
I’d still leave a little slack for the ferry on Day 1 and Southern California traffic on Day 3.
Day 1: 7h 20m driving — plan rest stops
Day 2: 7h driving — plan rest stops
Day 3: 7h 10m driving — plan rest stops
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