looking for a more efficient speaker.....

MC is a great amp. Perhaps due to age, some caps need replacement, especially since you already refoamed the drivers. Or same in the preamp. 

Can you borrow a friend's decently powered amp or preamp for an hour or two and try to narrow down where in the chain the issue is arising?  This would be way smarter than overreacting. 

IMHO Alon IVs beat most of the options in that list you posted. If the issue is the amp or pre needing service, and you find out by trading speakers, you will feel terrible. Cheers,

Spencer

I think you’re making up an amp problem where there is none.  The McCormack DNA-500 is a beast, and your amp almost doubles power to 900Wpc into 4 Ohms.  You’ve gotta be kidding me if you think that’s not enough power.  Look elsewhere for whatever issue you think you have.  This is absolutely silly. 

soix the issue is clarity not power, i went thru this with my wifes cj mf2500a and jeff told me to have it svcd.  its still not broken in yet due to my wife dont play it much and health concerns. it just might be this tube though. i notice i have good days and bad days with these stock 6922's

s bank you might be on to something,  but i talked to steve mc and he said he doesnt think it needs svc yet and i dont have problems with my ears so....

You’re going about it bass awards. Choose a speaker, then the amp to drive it.

sorry sbank i do have problems with my ears, on meds.....