Most conservative republicans who oppose Trump are not conservative at all. Naming a few will prove the point, Jeb Bush, McCain, Myth Romney, George Bush, Paul Ryan, Mitch McConnel, Glen Beck, I think it proves the point
Many of the people you mentioned would be very happy with the “moderate” label.
Personally, I don’t think G.W. Bush was a bad President. He could have been more conservative. Even so, the left still suffered from Bush derangement syndrome.
My greatest disappointment with W is his current negative attitude towards Trump. By now, he should have gotten over any bruised feelings, from the Jeb-Donald contest. W should be firmly in the camp of President Trump(R).
I saw W throw Nixon under the bus “the lie that was Nixon.” Now he doesn’t support Trump. I would like to support W on both the economy and Iraq, but he has not earned it. I still might offer defenses, for the sake of our understanding, for our nation, even for the party, but not for the man.