Many people find the Z-customs to be of a terrible sound quality when played by themselves. Great live, terrible acoustic, or so I've heard. My wrists couldn't handle them either, I find even power crashes a bit too cumbersome and insensitive at times. To be honest, if you play metal you don't have to use heavy or large hats. 13"s are just as suitable as 15"s. Just try some out and choose; it's the only way really. However, since we're talking about hats, heavy will give you a very clean bright cutting sound. And many models are on the thick side anyway, therefore Z-Customs/Rudes may well be what you want, I hear the Rude Soundedges are stupidly versatile.