I've made a lot of electronic projects but nothing where I had to monitor the amperage (much). I've had to fiddle with those voltage regulators, and mini buck coils to step up voltage for use in LED projects.
If I get this wrong sorry, but from what I can tell electric heating elements operate by joule heating, that is, the more current the more heat. Raising the voltage indirectly raises the current which can (I hope) be reduced with a simple resistor. From my calculations (which are probably wrong) you only need about a 3-4 ohm resistor to make 4.8 volts equal to 3.6 @ 2 ohms (a typical atty value). You may want to put like a 10 ohm pot on there and try out different settings.
I've worked with those voltage regulators and they usually reduce voltage by charging tiny caps in series and discharging them in parallel thousands of times a second. The end result is that they lower voltage while raising amperage. On resistive loads this isn't such a big deal, but without a resister the voltage might be lowered but the current (which makes the heat) is actually higher, thus making it kind of useless (I think).
Anyway just my 2 cents.
