Hinge Project

When we had our house remodeled several years ago, they built us a very nice pantry in the utility room, with a door that has shelves for storing lots of stuff. 
The only problem with that is that the darn door is too heavy for the hinges they used to hang it. 
The contractor used hinges like this -

which worked for all the kitchen cabinets, but constantly go out of adjustment on the pantry door, causing it to sag and hang open at about a 30 degree angle.

I had thought about replacing them with a six foot piano hinge, but the "expert" at Home Depot suggested these instead.

I bought three plain ones and two with an adjustable self-closing feature.  I'll probably get started on installing them later today, and I'll let you know how it works out.