Would someone please inform the uninformed (me) as to why these double trigger "experts" recommend a heavier weight pull on the rear trigger? If it is because they assume that the rear trigger will be used second it is the height of hypocrisy, because these same people tout the advantage of instant trigger selection. The greatest advantage of double triggers, aside from reliability, is instant selection of barrels (chokes). By making the rear trigger heavier one is assuming that the front will always be used first, which is a faulty assumption.
From someone who has shot double triggers for fifty years, my opinion is that the perfect double triggers should be adjusted to as near the same weight pull as possible, and that somewhere around 3-4 pounds. And I will again state that I believe the vast majority "experts" who tout the instant choke selection of double triggers never pull the rear one first anyway. This has always been the case. If you've messed around very much with original sidelock hammer guns (breechloaders and muzzleloaders) you will have noticed that most all of them that have normal wear have a much weaker right hammer spring than left.
Stan