I'd be tempted to file the TiTo clamp by 1.5-2.0mm, as it looks just about chonky enough. Obviously not a great plan A though, would rather buy a dedicated 7x9mm rails post.
Where? Don't touch the cradle, there's not the material spare. There might be room to mill the two side wedges to make the upper and lower cradle sit 2mm further apart
I'd be tempted to file the TiTo clamp by 1.5-2.0mm, as it looks just about chonky enough. Obviously not a great plan A though, would rather buy a dedicated 7x9mm rails post.