Dunno that George Will hated Reagan, but he sure didn’t back him in the 1980 primary. He backed Howard Baker and GHW Bush.
Krauthammer wasn’t pretending to be a conservative yet, in 1984 he was still a Democrat liberal writing speeches for Walter Mondale in the attempt to deny Reagan a second term.
Buckley and the whole NR crew were early and eager backers of Reagan (back when National Review was a great magazine and not the worthless farce that it is today). I don’t recall any harsh criticism of Reagan by Buckley .
I think Buckley was puzzled by Reagan who went outside the box so to speak. Buckley didn’t seem to get that the problem was the unconstitutional 80% portion of the federal government which Reagan declared was the PROBLEM, not the solution.
So called conservatives seem to have a hard time with the Reagans and Trumps of the world who step outside the box and rather Drain the Swamp (the Establishment) to which many of theses “conservatives” have annealed.