looking for a more efficient speaker.....

What are the other components in your system? A system is the sum of all components  it might be better to swap the amp… your speakers are generally thought to sound very good. But that will depend on the space you have them in.  There is a place to put photos of your system and   venue. This is really helpful for us to understand how to help. 

I had a pair of Usher speakers.  Sounded pretty good but I had to drive at moderate  levels for them to sound good.    I now have Tekton Lore which is a small floor stander.    The big difference is these speakers provide full sound even at low volume

Highly Efficient speakers:

TANNOY

REFERENCE 3a (>92db) 

- Google them to pick the model that stirs your drink,

- then look for them (preowned) on AGON, CAM, USAM 

The Alon IVs are very good and compared to new prices or even used prices of more recent options, you'll be hard pressed to match them without spending fairly big bucks. The big woofer and deep low end of the IVs is a strength. With most speaker brands a common compromise to hit various price levels is first get good performance in mids & highs, then in higher prices, get larger cabinets and more low end performance. So keep that in mind as many of your choices may play louder and more efficienctly with your amp, lesser impactful and quality bass may be a risk. 

@ghdprentice 's suggestion to post your system and room details on a system page is the best advice. 

FWIW, once you share that, amp change suggestions may make more sense. 

One other question is there any chance that the cones need refoaming? Millersound is the industry standard for that...it's quite reasonable and considering the age of the Alons may be worth researching before placing a large bet.

PS: I'm a former Alon II, Alon V and Nola Viper Signature owner. Cheers,

Spencer