I haven't found any shoes where the heel stays in place, except for my Nike sneakers which have a sock-like interior. So the shoes are the right size, maybe the width is the problem, I have narrow feet.
Men's Merrell Jungle Waterproof Slip-On Loafers in Gunsmoke - Shoes for Superior Comfort and Style
47 Review
Bostonian Bolton Loafer: Sleek Leather Shoes for Men
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Ultimate Comfort and Style: Minnetonka Men's Sole Moccasin Taupe
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DANSKO Wayne Black Size 11.5-12 Regular
51 Review