A search warrant needs to specify a particular place to search and particular things to search for. So, even if there was an LEO that was going to fabricate evidence to support such a warrant…what would they fabricate evidence to point toward that would actually be useful?

Also, while it may not have mattered to the LEO fabricating evidence against you–assuming your story is accurate–it may be that the particular folks involved in the SBF investigations are less willing to commit crimes of their own to advance it, if not for ethical reasons, potentially because the attention to the case and the resources likely to be deployed by the defense make it rather more likely than in your case that either (1) such a crime would result in criminal consequences for the government agent committing it, or (2) manufacturing evidence would compromise any prosecution of SBF.