Honestly, if you're looking for something based on a small size, a used Shuttle 6 or Eden WT 400 would be perfect especially for your needs. Depending on how loud you need to play, the Eden may not do the job but I'm sure the 6 will. I know it wasn't loud enough through a avatar 410 going up against two JCM 2000 half stacks, playing metal. It was close enough to cutting the job however it clipped sometimes, especially with my fretless, and I can't have that. However, they sound like pure freaking gold.
Maybe even think of getting a different cab too...you could easily sell the Ampeg and get a used Avatar, Genz, or regular G&K 410. Surely those would be louder and would punch through the mix a lot better. The cab can be as important as the head.
Maybe even think of getting a different cab too...you could easily sell the Ampeg and get a used Avatar, Genz, or regular G&K 410. Surely those would be louder and would punch through the mix a lot better. The cab can be as important as the head.