I learned that bay bass are biting well during gloomy days in SoCal so I took the opportunity to go with basic finesse drop shot with Yamamoto Scope Shad 3 inch. Couldn't figure out how to stroll with it, but it sure works on drop shot.

Good deal.  I primarily use the small Scope Shad as a Ned bait.  My go to on the dropshot is the Shad Shape Worm, Pro Senko, or Kut Tail.  Glad to see it worked for you.  

I like the fact scope shad makes it possible to work "fast". I know it sounds ridiculous on a drop shot but I am working on it horizontally 99% of the time so having pintail style bait works as a bottom hopping when texas rig won't work (or gets drifted too often by the wave). I need to play around more with paddletail style like Berkley Maxscent one and probably your suggestion to get to know more.

It’s not unusual for me to have three dropshot rigs on my deck.  One setup for vertical presentations, one for casting and one for dragging or drift fishing.  All with different baits, weights, and tag lengths.  Some will double with other presentations, like my vertical setup on bed fishing. Dropshotting was one of the first finesse techniques I picked up 30 some odd years ago and it has been very successful. 😉