How are you defining max strength? Generally people use a 1RM or similar type test to determine this… if that is your determinant of max strength then is it any wonder that practicing that specific skill (high % lifts) would have the best carryover to doing that particular skill (high % lifts)?
In the short term lifting with heavy singles and doubles is probably gonna be your best bet for improving 1RM of a given exercise. In the long run its not really going to matter if you do 1s, 5s, 10s, etc… improving your strength is all about progressive overload. The best method for improving max strength is the one that suits your program and schedule and allows you to make the most progress in terms of adding weight over the long haul.