That's quite a review, Magnus. I haven't tried one yet, but to me a regular Gotoh brass block already improves a lot, especially in basswood.
I am not against you (have not tried the Gotoh block like that) but just out of curiosity, have tried with another block?
I mean that the block would be the only thing you clanged (same guitar and everything ells).
Why would it improve more/better in basswood?
I think the actual sound change of a block change would be the same no matter what the wood is. And since those blocks and trems are more or less identical are the change the same all the time (not like wood where all bits are different). I call those parts the consistent parts of a guitar, tuners, bridge and some others (I mean, a change from one EGDE trem to another will make very little or no change on the sound).
A change from one bit of mahogany (or any wood) to another will sometime make a massive change in sound, so I call wood non consistent parts of the guitar.
I might like the change better if it is a mid range heavy guitar with muddy and unclear high end than I would do in a very bright guitar that lacks mid range.
But no wood type are consistently "muddy and unclear high end" or "very bright guitar that lacks mid range", no wood type are consistently anything sound wise.
(Prof of that is that no one I ever meet have been able to say for sure what wood a guitar are made of as soon at it comes paint on it. If I would make 50 RG's in 5 different wood types and paint them all black. And everything ells beside the wood would be the same would no one in the world be able to tell which guitar that was made of what wood.
No one could put all the guitar of the same wood in one corner, a different wood in the next and so on. What I'm trying to say are, all basswood guitars don't sound the same, or even close).