I think the duplication is a strategy the forum ought to attempt one season.
Scatter gun is less likely to achieve a full house IMO.
So the duplication is likely a better thing, and probably should have been done even more.
Focussing on a core group of horses and perming them each month, and then reacting to issues/form over the season is probably the best way to get success.
You could start with just the six (and rank them) and simply perm them over the summer months, and then once the season starts react accordingly with replacements etc.
I think the Yankee master
Faugheen_Machine is doing something like this.