You can't wet vent the kitchen sink over the shower drain. Too many fixture units on the sink for that to work as a vent. Only "1 and 2 fixture unit" items can wet vent.
The kitchen sink is a "3 fixture unit" fixture.
Doing so will siphon the p-trap on the shower.
Run the kitchen separate from the shower, and tie those vents together at 42" from the floor.
The shower needs 2" waste with 2" trap
The kitchen sink needs 2" waste with 1.5" trap
The "overhead" venting is fine with 1.5" for the washer, sink and shower.