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Yes, caulking or sealing your vinyl gutters is a good way to help prevent gutter leaks. When you’re installing gutters, it’s important to overlap the sections to help avoid issues like leaks or drips, but they can still happen. In this case, adding caulk can help. Make sure to use a caulk designed for multiple surfaces, like a silicone-based caulk. You can also purchase a gutter sealant as well, which is specifically designed for this purpose.

Gutters should not drip at the seams. This problem could indicate that water is collecting in the gutters instead of moving to the downspouts. You could have leaves or other debris blocking the flow of water at the seams. Try cleaning the gutters, adjusting the slope, and sealing any holes or cracks in the material to fix this problem.

If your gutters get overwhelmed every time it rains, adding an extra downspout is a solution. First, you'll need to decide where to add the downspout. If your current setup only has a single downspout, one option is to place a new one at the opposite end of the gutter. If you already have a downspout at each end, adding a third one in the middle can help to lighten the load. 

You can hire a professional to add a downspout yourself by cutting into the existing gutter and attaching the necessary parts, such as an outlet and brackets.

In most cases, it makes more sense to repair leaking or damaged gutters than it will to replace them. You’ll spend an average of $400 to repair your gutters, while full replacement will cost around $2,000 or more, depending on the gutter material and style and the size of your home. If your gutters are nearing the end of their lifespan—usually around 20 years for aluminum or vinyl gutters or up to 50 years for copper or steel—then it might make sense to replace them, as it could cost you less in the long run.