Altec 605a upgrades?

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I’ve had a pair of these for several years now. They are in 620 based cabs with stock crossovers. They have been reconed at gpa and are in fantastic shape. I really like them, but, I got to listen to a friend’s JBL 4355s for a week while he moved. I learned that the 605s roll off on the bottom at around 30hz, and on the top end 13.500. I can fill the bottom with a sub without much trouble, what about the top? I really miss the extension of the JBL. Markwart x-over? Super tweeter on top of cab? Diaghram swap? Almost forgot, I’m running them with a Bob Latino st-70 coupled with a MAC mx 110z.
 
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