Blackstar HT 60 -- Recommended Speaker Replacement

I currently am in the search to replace the speakers in my Blackstar HT 60 combo amp. My guitar is a PRS thin body 24 fret with stock pickups.

I play mostly rythym with some lead work but like a deeper bass sound to my tone adding a nice fullness to my chording. I tried originally replacing the stock speakers with a Celestion vintage G12 30 and a Celestion G 12 H  - 30 watts/15 ohms/55 Bass Resonance. The combination of the two provided a better sound but not the tone I was hoping for. I am considering swapping out the Vintage 30 for another speaker but not really sure what WGS has that might bring me into the ballpark of what iam looking for. I have You Tubed some vids from you guys and like the sound of the Reaper but honestly unsure of what model amongst the three to try. I am plannng on keeping the Greenback in place and adding a new speaker to the cabinet. Can you please recommend a possible replacement speaker or speakers that might fit the bill. Some of the music covered is Joan Jett, Black Sabbath, Judas Priest, Neon Trees, Lit etc. Thanks in Advance for your help !!