DSP ? or send one to Danny @ GR research he can fix them  see if he allready has a fix for that speaker? i just watched 2 YT vids about him fixing a pair of $27.5 K Wilson watt puppies! wow $27 K and they are real POS needing a LOT of re-work to be optimized!  weird! 2 part YT video! 
https://youtu.be/Tma9jFZ3-3k?si=GcgkV3o2Ep5KvSaA
https://youtu.be/pIt2pcQvf6M?si=V-nu0XtiWsQXfQlx
his kit for B& W is   
https://youtu.be/wmmw8QlThPk?si=Svwa4ln20v7rZkVn
only 54 parts! needed a lot of fixing ! LOL 

B&W 802 S2 Upgrade Kit (Pair)

$525.00–$692.00

The price is per pair.

This upgrade kit fixes a number of issues and greatly improves the quality of the crossover over the stock network.

The kit includes all of the necessary crossover parts, along with wire, solder, heat shrink and a set of tube connectors.
A new crossover/mounting board is not included.

Bass-Alignment Filter: B&W’s “bass-alignment filter” is compatible with our upgrade, as it only addresses frequencies below 100Hz. however we do not recommend it as it is more of a “band-aid” than an actual fix for poor room acoustics, while also robbing clarity from the midrange and treble.

B&W upgrade kits….

"These speakers and all the tweaks offered by other forum members (and now upgrade kits) suggests there are just some flaws with the design. Is this tweaking and upgrade path normal with speakers?"
yes tweaking is VERY normal now for many speaker brands and models no the comparison to some turntable w/ issues is irrelevant . there are experts who have done the research and come up w/ fixes when  you have a speaker you like it makes sense to resolve some issues it has and keep it . sometimes it is cheaper than buying a better model sometimes not . but at least you know it is the best it can be lets say you buy a upgrade model it may have issues too!