I don't think you are going to find local help to recone. There use to be a guy in the area named Curtis, but he was primarily JBL. Not sure if he is still doing it. I have limited experience and know what is needed to be done, but I am not really running my shop full time anymore because I travel alot with my day job,so unless your patient, I can't help either.
This Blurty sound can happen from degraded foam , rip in a cone, spider glue separation and , what i suspect in your case, the voice coil has overheated and caused the enamel to crack. This lets the 1 solid coil wrap separate and flop about wildly as the volume increases. It is no longer solidly attached to the voice coil former that looks like a nylon or stiff paper tube.
Spider re-glue is easiest, then refoam is second hardest.. You didnt report a rip in the cone so that is probably out. The last requires a recone.
Sounds like the best option is new drivers.
Good luck, -eric