With the exception of ni200, you don't need to build spaced coils for tc provided you dry-pulse then to ensure consistent heating throughout the coil; a hot spot or partial short through a coil will throw off the atty resistance, rendering TC useless.
I always try and fit coil size to the atomizers air inlet; it seems to reduce spitting on atomizers prone to spitting and I feel it reduces coil ramp up time a bit, as more radiant energy is transfered to coil vs saturated wick.
To answer the question about stainless steel rotowound (clapton) coils, I've ran an El Cabron with 26 awg 316sl SS core, 32 awg kanthal wrap. TC works just fine, the extra coil mass need a wattage adjustment to compensate for the ramp-up so you will drain your battery a bit quicker. I know I'm not alone feeling that "clapton" coils don't offer any flavor difference or vapor density vs a naked wire coil. At a certain point, the main factor to vapor production is the coils radiant heat output to the volume of the wick, because juice vaporization is happening in the wick, not on the surface area of the coil.