EricO: To answer your question I have only heard briefly of the canting technique to avoid the holdover. In my opinion there isn't much on the side of the rifle to index on, so I dunno how well it will work. It might be a good emergency aiming method if you want to aim at a short range sorta precise target but you still want to see what the bad guy is doing instead of blocking your view of him by the 2.5" high hold. Obviously that's a "real" application as opposed to a 3-gun match.
I myself practice getting good at aiming for the holdover point knowing that it's different as range changes.
Again just my opinion but one sighting method only per firearm seems the simplest way to go, whether it be reflex, iron sights, Aimpoint, Leupold, etc. I know in theory you can use iron sights with some dot scopes and such but in practice it takes a significant amount of time to decide "uhhhh, can't find the dot, durn, batteries must be busted. I'll use the iron sight, now where is that thing? huhh, it isn't high visibility red like the dot, there it is, now where do I want to aim?" (preceding thought pattern in less than one second).
So in summary, I'd stick with the sight you already have, and whatever you decide, if it works for you, have at it!