I use a high grip on the 442,642 as well. But I did not like the stock grip panels. Could not acquire the right feel with them with a high grip so I started messing with different panels till I settled into a set of Pachmayr's. I found they were just fat enough to allow for a comfortable high grip but not to fat for holstered pocket carry.
Shot the Pach's for awhile, then went to the Crimson Trace grips finding they were a lot like the Pachmayr's.
Maybe trying some different grip panels would help.