No, I could crop the BD to match the LD; but, as the LD image is smaller than the BD, I could not crop it... infact, poor results *may* be also due to the fact that the script tries to match two images that are basically quite differents between them... I don't think the 3D BD would be better...
But, did you see the last test clip? It's OK? Too much blurred? Too much sharpened?