A friend on the 767 informs me that his F/O actually argued with him (flying in the same general area as AF recently) that the "best" radar for thunderstorm penetration was "MAP".
Don't knock it until you try it! Based upon my experience and experimentation with the 767 radar, that is the best for painting "dry" ITC buildups. MAP and one notch down from MAX GAIN. This procedure was developed by a group with many decades of ITC experience and in the past also used expensive NV goggles as another layer of detection. NV goggles are now cheap enough in HK that one can afford to do their own research. Our Tech-Safety group also provided a copy of Archie Trammell's VHS tape.