Exotic builds aren't always "best" in a mech mod, because you are depending wholly on your battery to "heat" the build, and if it's a large mass of wire, that is going to take time to heat up. With a regulated mod, you can set your wattage where it is comfortable to vape at and forget about "metal mass" although generally, if you have a higher mass build, it may need more wattage to heat up faster, depending on which regulated mod and etc.
Maybe try some simpler builds in your mech and see what happens?
Anna