If I'm right smaller wires parallel have less heat capacity so they should ramp up faster and hit harder?
Yep, you got it. You can do that. As I said before, you can run dual parallel 26g or dual triple parallel 28g for builds that have decent surface area and quick ramp-up. The DTP 28g is feistier. 5 or 6 wrap, 2.5mm dual triple parallel 28 is really warm and full (I believe Zamazam aptly described parallels as being "chewy.") You could also try smaller coils with thicker wire. You could do like 6 wraps of 24g @ 2.5mm or even 2mm. You could also try something like a 6-wrap, 3mm dual 22g. Builds like that still have plenty of surface area, but they're small enough that they still heat up quickly at their natural range.
Twisted wire will get you more kick easily, as well. Dual twisted 26g is pretty gnarly.
Tiny, yet fairly-high surface-area coils that pull lots of power will heat up quicker and keep up better. Remember, your batteries inherently sag under load (increasingly more so with really low sub-ohm coils,) and after that, there's drop from the components and connection points in your setup. Not only that, but your voltage continues to sag the longer you hold the button.
That in itself drastically changes the performance. Reggie boxes hit harder because they are consistent. When you run one at 3.9v, it always kicks out exactly that, while a mech will begin to drop below that almost instantly. For instance, if you take a build that already hits hard on a mech, you might find yourself running it to as low as 3.6v on a reggie box and still having it hit harder. It's going to be heating up that much faster just because the power coming to it has no drop-off.
It all can add up to more power loss than you would expect from even the most ideal setup. Some hit harder than others, but they're all subject to the same limitations.
They're simply not as power-efficient and you have to build around that. No quads... ...no elaborate builds. Simple, smaller-id, power-hungry builds are your ticket. In some atties, it's not always such a bad idea to dial-back your airflow a bit, either.
Gonna play with some nichrome too if you think it'll ramp easier, Im just a little iffy about nickel core wire.
It will heat up faster just because it pulls more power for your surface area. While it isn't absolutely necessary for hard-hitting mech builds, nichrome makes it easier to get the heat there for large coils.
I'm just looking for a little advice to get me in the right direction and maybe save me a couple feet of wire lol.
Haha, that's inevitable though.