There is a vast difference between a mech and a regulated. With a mech even at full charge on the battery at 4.2v, that is all the gas pedal you have, and this doesn't last long, median vape voltage from the battery is about 3.5 to 3.7v and platues from 4.2 at about 3.9 to 3.7 the longest. More mass of wire in your coils, the longer it takes to heat that mass up or you have to throw a lot of power at the coils, namely voltage or amps, regulated mods can ramp fast because they do it by constant voltage, mechs you have to use the latter, amps. This is where Fused Claptons, juggernaut wire, all your really intricate coil wires suffer with a mech, and a way to compensate is use thinner wire, less intricate wire, and a big factor, a high amp battery, namely a true 30amp, which there are only 3 true 30amps, LG HB2, HB4, and HB6, downside to them is they sacrifce mah (run time) for higher amps this is the balance manufacturers have to deal with, power or run time (energy density).
This is also where all those super thick wires start to nose dive, 24awg (precipice of balance), 22 and especially 20awg, again thicker your wire, that much more battery charge you waste ramping up coils instead of actual vape time. I can get a better vape of a dual parallel or dual twisted or dual basic single core clapton with 24awg or 26awg than most can with a triple core fused or staple fused clapton, about 40% more vape time over those super mass coils, more vapor time = more cloud in a shorter firing time
. With a mech, larger coils does not = better vapor or clouds, nor does super low ohm, once you reach that balance point at around 0.3 to 0.25ohm efficiency and safety nose dive as well.
Single basic or single parallel/twisted in a small RDA, great little daily flavor machine.
Dual coil basic, parallel/twisted/basic single core claptons, good balance between flavor, efficiency, vapor
Triple coil = best flavor chaser build
Basic Quad Coil = king of clouding
Its about practice and experimenting, just remember with a single 30amp battery the safety threshold resistance is at about 0.25ohm, dual battery parallel mech box mod it is about 0.14ohm, dual battery series like the noisey cricket it is about 0.56ohm.
1) Mech being copper, good choice
2) RDA aslo copper, good for the conductivity, just watch the internal corrosion or patena inside if it is copper internally, if so I personally wouldn't use it
3) Batteries, to get where you are sounding to wanto to get, those VTC5 being 20amp are not helping, their newer iteration the VTC5A having 25amps and a strong voltage sustainability would serve you better, but nothing on the market in a single battery mech can match an LG HB6 in the quick rapid hard hitting category
4) Coils, on a mech remember this K.I.S.S. (Keep It Simple Stupid), simpler the coil, the better when cloud chasing. **Stupid is not meant to be insulting or derogatory**