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Hello and welcome!
The CS4 is a decent antenna, but there are others with even higher gain.
You main problem seems to be that the stations are starting out rather weak, and then you have tall trees in the way. Trees block more signal when they are wet, and that is probably enough to be causing your channels to break up.
It's usually impossible / impractical to get around or over most trees, so the only option left is to try to make up for the signal loss by going with a higher gain antenna. If your antenna is sensitive enough, you might be able to pull in enough signal despite the tree blockage.
For a high gain antenna, I'd consider something like the Winegard HD8200U. It's a very big antenna, but does well across VHF and UHF bands. The CS4 is probably doing poorly on VHF channels like KSTW (ch 11) and KCTS (ch 9).
You would also benefit from a pre-amp like the Channel Master 7777, Winegard 8275, or Antennacraft 10G202. These will boost the signal immediately after the antenna and minimize the signal degradation you would otherwise get from cable / connector / splitter / receiver losses that occur after the pre-amp. This would probably give you an extra 2-4 dB of margin to help prevent your channels from dropping below their breaking point.
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