If its still under repair warrantee why not let them take another stab at it?
A little more than your budget but light years better than your short list.
https://www.audiogon.com/listings/lis906f7-velodyne-dd-18-subwoofers
Not all subwoofer room optimization is the same.
Velodyn's first incarnation of their Automatic or Manual Room Optimization did a better job than the initial JL Audio F113 version and the REL Studio III was simply missing in action when I compared all three in home at the same time.
A little more than your budget but light years better than your short list.
https://www.audiogon.com/listings/lis906f7-velodyne-dd-18-subwoofers
Not all subwoofer room optimization is the same.
Velodyn's first incarnation of their Automatic or Manual Room Optimization did a better job than the initial JL Audio F113 version and the REL Studio III was simply missing in action when I compared all three in home at the same time.