+1 jjss49.
Maggies operate at low impedance, driven more by current than watts. Bridging an amplifier produces greater watts at the expense of current.
I am not familiar with your Rotel amp. If it delivers far greater watts into low impedances than the rated watts at 8 ohms, and it sounds clean at high volumes, then it seems OK on the power front.
Advice on improving the presentation requires more information regarding your source, room size, room treatment, speaker placement. Are you willing to pursue options other than the purchase of a second Rotel amplifier?