2nd speaker to add to 2x12" with ET-65 already

I’m looking for recommendations on what speaker to add to my slanted vertical closed back 2x12” cab (Carvin).  The gt-12 (carvin’s version of the v30) are very bright and almost nasally, don’t like it all except for under high gain where solos sound great.  I have an ET-65 in my 1x12” semi-closed back cab and I just love it.  I just received another ET-65 which I placed in the bottom of the 2x12”.  It helped with the sound as I got some of my low end back but that nasally clean sound is there as well as not enough low end.  I was thinking since I don’t like the GT-12 and probably V30’s in general (removing vet30, retro off my list), of either picking up another ET-65 or an Invader.  Which of these two or even another speaker would you recommend?  I’ve listed these as I also want to try to have the same sensitivity with the ET-65.  I’m playing thru an Engl Ironball and play metal but still want a decent sounding clean channel.

Thanks

Jeff