Well, I'm probably not much help on this one,
I don't have an Encore, but in Contender I have a 45-70 bbl. Mine's never had these kinds of issues.
I'm wondering if it has something to do with the way you're holding/resting the gun? Could you describe your shooting technique? I'm wondering if you're somehow "locking down" the fore end to shoot it, and this time the screws were backed off inadvertently, causing the screws to bend?
Dunno on this one...
As to the fix, sounds like you need new screws and new inserts for that barrel.
How's the fore end? tweaked, or still usable?