I have played Maltby club heads for years, have hit ping G400 max with Alta cb r flex shaft. I really hit it well, what shaft does Maltby sell that would come the closes to matching this shaft.
Ping lists the Alta CB 55 R flex as a 55 gram weight shaft designed to produce a mid/high launch. In our Maltby MPF Pro Series shafts the closest we would have would be the Pro Series DR (MA0289) which is a 60 gram R flex designed to produce a high trajectory. A shaft I would look at would be the Kuro Kage Black HBP 2nd Gen (MR0044) R flex which is a 57 gram weight shaft and designed for a mid launch angle.