Heavy weight and edge sleeper.

I am over 250 and tend to sleep on my side right at the edge of the bed. My current mattress, a Denver Athlete's Choice hybrid, is less than a year old and the edge has little support left and I feel like I am sleeping in a hammock. Unfortunately because of the 3" foam I cannot prove the 1.5" sag.

I have been looking at Titan because it is designed for heavier people, but my wife is only 160 so it may be too firm for her.

How would you compare your mattress?