I've been all about that box life for a while now, I recommend it. There are a bunch of great VV/VW box dual 18650 (series) box mods out there, and at pretty competitive prices. The Sigelei 100W+ boxes are pretty nice, I definitely like the button and they're very user-friendly. The IPV3 is alright, I have one myself, but it has its quirks (the non-magnetic door is a bummer). I also have a custom-made Hammond box mod with an OKL-T20 chip (110W max), and it's my go-to every-day vape.
With 2x 18650 batteries and variable voltage, I can easily make it last all day. The benefits of VV are also that you can build more variations of coils and just adjust the voltage to your coil. With a mech mod, you're building to whatever voltage your battery can dump out. For example, my 14-wrap .55 ohm coil is FANTASTIC at 60W on my box. Huge clouds, great flavor, the surface-area really makes it shine. I can out-cloud a .2 ohm/mech mod on my .55 ohm/box any day. On a mech, locked at 4.2V (a battery at full charge) it's a fairly unsatisfying vape.
Box mods also tend to eliminate issues such as voltage drop or hot button (besides the tiny voltage drop lost to the chip), which speaks to the particular problem you're having with the Blackhawk.
In terms of mech mod options, I haven't bought a new one in a LONG time (a year or so). Box mod lyfe. I've been eyeing up a SMPL clone, which I've heard are fairly decent quality. igetcha69 on YouTube does a lot of mech mod reviews, might shell out the big bux for a nice authentic as per his recommendation. Also Bombies/VapeApe have been working together to make a pretty neat-looking mod. There are pictures of it on the Bombies Instagram.
If the Blackhawk is still getting hot, please stop using it. For your safety.