Most modern amps are designed to give virtually full output with the gain around half. It's a marketing thing to make you think there is a lot more to come.
Notable exceptions being EA gear and the Ashdown Retroglide.
Another 208 would make a massive difference as the additional speakers will shift more air and 2 of the same speaker cabs is the way to go.
Regarding a new amp, I was a massive Mark Bass fan until my last one went faulty and the only place to get it fixed, (same company TC use), made it an uneconomic repair.
I switched to Ashdown and had a RM500 and Retroglide 800. Both great amps and Ashdown customer service is legendary. The will repair any of their products at reasonable cost.
There's a Retroglide for sale in the amps section. Nothing to do with me I stress.