Both your Mod (Reuleaux 2/3) and mine (SMOK AL85) are what what are commonly known as "Regulated Mods", they have circuitry in place to operate them relatively safely. If we place the battery in them incorrectly for example, we will get an error message on the display. If we use a coil in them that is somehow 'off', we will get an error message as well. Our mods are for beginners and veterans alike that simply want to reap the benefits of vaping without having to do 'too much math' when it comes to rebuilding our coils etc.
This of it this way: You have a couple of cars and you want to drag race them both. One is has a manual transmission and you have to watch your know your torque curve in order to pop the clutch at the right RPM in order to not peel out excessively at launch.
The other has an automatic transmission with the flappy paddles and launch control. With that one, you push a couple of buttons on the dash, hold the brake and gas pedals down, and the onboard computer does the rest. It holds the RPM's at optimal so when you let go of the brake the car launches perfect every time.
THANK YOU for the correction IMFIRE3605!
Ours is the flappy paddle car with launch control. No muss, no fuss, perfect everytime.
Unregulated mods are the manual tranny cars, they can be tricky because you REALLY need to know what you are doing. Very little if ANY margin for error BUT the reward is generally, a manual transmission can wipe the floor against an auto-tranny car simply because you have control of every variable when it comes to launching. BUT, and here is the kicker, you REALLY know to know your stuff because if your don't know what you are doing, you can blow your engine, burn out your clutch, stall at launch etc.
Don't worry about rebuilding your own coils, as long as you are using the regulated mod, you are in good hands. Do a little YouTube persusing like I have and get to know how to built them properly. I still do not understand all of it really, but I get a little wiser everyday, especially with the help and support and from the good people here in this forum. I have included a link to the STEAM CALCULATOR which will help you understand a bit more, as well as calculate for you the number of wraps for each coil you will need.
As far as what is optimal, there is none, we are all different, I like to Vape at 35 to no more than 40 watts, others prefer 100 + watts because their mods allow them to.
http://www.steam-engine.org/coil.html?