Your shower head might just be full of minerals.
So after a shower, some water is trapped up there, and slowly drips out.
Take the whole thing off of the shower arm, and remove any little plastic and rubber parts up by the threads.
Take a picture of how it looks before you take those little parts apart.
Lay them out on a flat surface, in the order they come out.
Clean any crud out of them.
Then soak the whole shower head in straight vinegar overnight.
Put everything back together.
If you still have a drip, you might need a new shower head.
Or, you might have minerals trapped in the valve, in the parts you just replaced.
Or, you made some mistake while changing the springs and seals, like not cleaning out any crud while you had everything apart, or you put one of the old seals back in by accident, or you used that Danco knockoff part and it might be garbage, get a genuine Delta set of springs and seals.
If there is also a pressure balancing unit inside your valve, that might need replacing also.
Also, after cleaning out any minerals or crud inside the valve body, goop a little coating of plumber’s grease on all the surfaces that need to seal.
The valve body interior, and the little plastic boots, and what they seal against, any o rings, etc.
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