STAR voting encourages single candidate votes too much if you’re voting for the underdog. Lets say it’s Biden Trump and Sanders. If I want Bernie, assuming hes the underdog to Biden, I have incentive to not rank Biden at all because if I do he gets points that could push him ahead of Bernie. Its in my best interest to make sure Bernie gets the biggest point differential from my ballot which means only voting for Bernie and no one else.
So for anyone who’s going to vote what would be third party, the best they can do is not rank anyone else, defeating the whole point and ensuring what people call the spoiler effect will still exist.
ALL the systems you proposed have problems, not just RCV. You have to pick your poison so to speak.