I don’t think delegates won by the presidential contenders are the same as for the congressional candidates. Congressional winners in primaries are strictly for local use in state or district and those are fine as it is.
But let’s say a liberal RINO candidate gets large wins in NY & CA primaries and beats out a solid conservative candidate,
is he or she our best choice?
I don't know that that has ever been a problem. If you look at the geography of California 50% of the state is red. It's the urban centers of LA, and the SF Bay Area and the coast that's blue. If both of my next door neighbors are Democrats does that make me less of a Republican?
Since the delegates are selected by the number of votes received, they represent the proportion of the party electorate in that state.