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RocksDB puts L2 files to block.db only if it’s at least 2560+256+1024 Mb (almost 4 GB). And it will put L3 there only if it’s at least 25600+2560+256+1024 Mb (almost 30 GB). And L4 — only if it’s at least 256000+25600+2560+256+1024 Mb (roughly 286 GB).
In other words, all block.db sizes except 4, 30, 286 GB are pointless, Bluestore won’t use everything anything above the previous «round» size. At least if you don’t change RocksDB settings. And of these 4 is too small, 286 is too big.
So just stick with 30 GB for all Bluestore OSDs :)