Your speakers are TL design. If you want ultimate bass then you should avoid a small woofer with a TL. I'd suggest to get a sealed high end sub like a JL Fathom 113 and use a filter to remove the bass from your speakers below 80 Hz. Alternatively, get a high end used big box speaker with the appropriate drivers - a Dunlavy Sc-V for example.
It looks like your speakers are your overall weak link - at least in the bass department.
It looks like your speakers are your overall weak link - at least in the bass department.