I've recently been playing simultaneously (with an ab-y switch) through an Egnater tweaker 40 with 2 1x12 cabinets, and an old Roland Blues Cube 40 combo. I love the clean tones on both of those amps, but they leave quite a bit to be desired when distorted. I know those aren't typical "metal" amps, but I dig em too much to get rid of them. Right now I use a boss md2 mega distortion (I don't use the "dirty" channels on those amps), and when combined with the dark murkiness of those amps, the distorted sound is not defined at all. I'm not looking for Meshuggah level "djent" tightness or anything, but more just a quality metal tone along the lines of Mastodon. I've never been a huge gearhead, so I have to ask...is there some (preferably inexpensive) way I can tighten up the sound a bit? Maybe an EQ and a different distortion pedal. Any advice is welcome.
PS I play through a Gibson SG (stock pickups), a Dean GS (stock pickups), and a Dean Evo (w/ EMG passive humbuckers installed)
Try using the drive channels on the amps along with an overdrive pedal (Digitech Bad Monkies are cheap and work well, though there are literally tons more cheap OD options) using low gain on the pedal as a booster for your distortion tone. The compression from the pedal helps tighten things up and keeping the drive low and level up keeps from muddying things up too much. If this doesn't work for you and you're still finding you don't get the sound you want a more boutique distortion pedal may be up your alley though you might just wanna save up and get a more metal suited amp down the road.
Welcome to the forum by the way!