I have more water going into the water Reservoir than into my coffee cup, no matter what size is chosen

It's likely that a good cleaning could fix your issue. Specifically, try these solutions:

1) De-scale the brewer. After a while the reservoir can become partially clogged with scale from hard water and should be de-scaled every now and then. To do this, run 1 cup of white vinegar through the brewer on a regular cycle. Repeat once more with a fresh cup of vinegar. Once that has finished, run it with fresh water until no trace of vinegar remains. 3 cups should do it.

2) Clean the exit needle and/or the entire K-Cup holder assembly. To do this, remove and disassemble the assembly. The parts are dishwasher safe (top rack) or can be cleaned fairly easily by hand. In addition, use a paper clip or other small object to clean the inside of the exit needle. Coffee grounds can become trapped and clog the hole. Be careful, however, since the needle can be rather sharp. Note, also, that the hole in the needle where the liquid exits is on the side of the needle, so whatever tool you use to clean it will not go all the way through.