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! :cheers:
Welcome to the forum by the way! :cheers: