I think it’s the reverse, the maxi balls are similar to the Lee REAL in that the lower part of the bullet should be a slip fit into the bore with the top band oversize and engraving on the rifling ( the Lee REAL in .45 has bands starting from the ba.452 .457 .462 .467).
OP’s bullets are too big at the base to slip fit and may not be loading straight in the bore. It may be best to try a different bullet before spending money on the tools to resize your current bullets.
Historically elongated bullets of bore diameter were used in target rifles so resizing the current bullets to bore size may work, probably best with a wad under them.