When using the reverse in the flare particularly when using full reverse for a so called "positive touch down" the trick was not to chicken out on the flare but continue the rotation, the reverse blew into the ground effect and cushioned the touchdown. A positive touchdown was the SOP for any form of wet or contaminated touchdown. A "target touchdown" was flown when landing on a length restricted runway ie. 13/31 at Turnhouse,in that case the reverse was selected in the flare but the flare was not prolonged past the normal landing attitude. John Cuningham was a great proponent of reverse in the flare and his flare profile was initially used for the Autoflare/Autoland profile. This profile had to be later modified to a slightly less extreme profile.