Depends on what you mean by performance. When you twist wire (any wire) you're creating channels for the juice to creep into. That's what gives you better flavor than straight wire. If it's flavor you want then yeah twisted wire is generally better. If you are just looking for vapor production, thicker gauge straight kanthal may work better for you. Depending on what gauge exactly and which RDA you are using also plays an obvious factor. Thicker gauge straight wire may also provide a warmer vape. Like the comment above, most people just stick with simple 24g micro/macro coils and they're perfectly happy. I just didn't wanna settle for vapor OR flavor. Or just a little of both. I want lots of both....
Anyways, the answer to your first question, you're probably just not twisting the wire enough. A drill will always work best for that sorta thing
you want your twists super tight, this is the best photo i have handy. The bottom line in all of this is, once you find what you like, then do it. Personally for me, i could never go back to just straight wire all by itself-the flavor just isn't there for me. It may be there for you though haha, to each their own!