RCV was the Murkowski Protection Act. And unfortunately, Trump did a rally for the other Republican candidate specifically against Murkowski and that had the Democrats all abandon their own candidate and rally behind Murkowski to stick it to Trump, with solidified her standing from that point forward. Prior to that it looked possible she might not even make the final cut.
As far as the House seat, there was already a Republican in the race that could have won outright had he been the soul candidate and Palin should not have gotten in - she split the vote, and the reality is that she was, and is, one of the most unpopular political figures in Alaska...her popularity is roughly the same as Biden’s.
We can agree on this, vote splitting is a scourge even worse than ranked voting. It is the weapon the GOPe uses to screw the base. McTraitor, Flake, Graham, DeWine and many others all survived because of vote splitting.