Do your different razors take different edges? Mine do. Or at least it seems that way. The best one I have is a razor I don't like very much, because of its size: a little German 4/8 spike. But it takes a WICKED sharp edge that feels very grabby & will bite with ease into the shortest stubble.

My W&B hollow chopper takes an edge like that, but seems to lose it fast. My W&B wedge chopper takes a very good edge, but not quite as good as the German spike, nor does it retain it as long (although it's more durable than the W&B hollow).

Aside from possible metallurgical differences, the only theory I have is that the little spike is very thin, owing to its small size. Its thinness makes it more like a DE blade than a str8.

Anyway, isn't it interesting how razors have personalities?