I have many basses that have serious low end mainly jb,s on black tapewounds or p basses on flats but the punchiest one is a tokai jb on black tapes it’s a very deep clean sound. Is it the upgrades on yours that gives it this thumping sound?
I have a Fort Bryan padded strap but the padding was slightly high for where I position my bass so I had a local shoe mender shorten and re stitch it , well worth £10 😀
I play reggae and a little bit of funk and I’ve been through quite a selection of amps and cabs for home use I currently have the MarkBass Little Mark 250 Black Line Amp and the Markbass New York NY151 Cab , it has great low end and a very clean sound , it works good for me 😀
I personally wouldn’t put wire wool anywhere near my basses , the fine fibres go everywhere , and can stick to the pickup magnets. if you’re after a silk finish Flour paper is the best option it’s used in cabinet making then as Gary Mac says buff with an old t shirt
I play with the thumb a lot , it allows me to get the really deep and warm sound I like, you can also get it up to quite a speed with double thumbing , and the muting just falls into place. a good example is Robbie Shakespeare