^ to me going with less knobs should make a faster rolling tire, but, i feel like the tire would be more susceptible to flats if you are riding on gravel.
a new saddle should make it more comfortable, but a saddle is a hard thing to buy online as there is a fitting component involved.
Might help if you could post a picture of your rig.
If you have hills to deal with, a different cassette might be worth considering
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