Considering Castaic is a deep canyon reservoir, I would stick to a Huddleston in ROF 12 and 16 and work the baits UPHILL off slowly degrading mainlake and secondary points.
However, considering the lake is extremely tough these days, I would stick to jigs and worms. If the water clarity clears up, perhaps a tailspin or a spoon may catch some active fish.

If there is a mudline created by wind/wake, working the deeper edge of the mudline with a Triple Trout may produce some nicer fish. If you want reaction bait fish, my hands down most productive baits is a LC Stacee 120 (only sold in Asia) or a Super Sledge 6 or 7 on 10# fluoro.

As for the striper question, the stripers are not as picky as the largemouth. If a largemouth will hit a certain lure or swimbait, most definitely a striper will hit it as well.
Good luck.