If you want to catch rain, you're going to need some fast shutter speeds OR longer shutter speeds and very short flash duration. Rain's terminal velocity is between 9-13m/s (32-47km/h) depending on who you ask.
If you're using a flash, dial down the power output which should shorten the flash duration. Have the shutter and aperture set to give you a black background (if that's what you're going for), and then adjust the flash power until you have enough power to illuminate the raindrops and also stop the action.
I really like the first shot you posted, the reflection is cool
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