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Yes, reducing the level of the strong channels is necessary before the preamp.
The 7777 is too much gain so the winegard would be a better choice.
Either way, preamps will also amplify interference as well so only use one if you have to and only use enough gain to compensate for coax loss
Vhf signals generally don't need to be boosted at all or very little due to much lower coax loss at those frequencies
The winegard ap4700 preamp was ideal since it only amplified UHF signals and passed the vhf.
But they quit selling them.
The notch filters are a good idea and will also introduce loss so be aware of that fact
All these guys have provided great info on filters already and I have nothing to add there
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