You are describing the journey of every person that has used a Meatbox, me included 🙈
The first time I plugged mine into my amp, I was so underwhelmed. I managed to get one of the OG models from back in the day, and it just didn't do anything for me... that's until I took it to a rehearsal and plugged it directly to the PA via a separate DI.
BOOM, literally... Haha. That's when I understood where this shines.
Amazing for pop, hip-hop, etc... gigs where you need to either step in for a synth or share low-end duties with a synth/keys player.
I have never managed to get a good sound of it through my amp, I prefer to use an octave pedal or even some EQ if I need more support in the low end.
It is one of the most misunderstood pedals out there, especially the 1st version, where each knob has weird names 😅