Ah yeah, that didn't even click with me. You were using the single Greenback. Yeah that can be dangerous.
Look at these:
https://wgs4.com/invader-50-50-watts
https://wgs4.com/liberator-80-80-watts
They could go well in the iso-box and handle some power.
The Celestion Creamback is a higher power handling "Greenback" as well. I've never heard one in person, but they get great reviews.
Classic - G12M-65 Creamback - Celestion - Guitar, Bass & Pro Audio Speakers
Look at these:
https://wgs4.com/invader-50-50-watts
https://wgs4.com/liberator-80-80-watts
They could go well in the iso-box and handle some power.
The Celestion Creamback is a higher power handling "Greenback" as well. I've never heard one in person, but they get great reviews.
Classic - G12M-65 Creamback - Celestion - Guitar, Bass & Pro Audio Speakers