I agree, the fit was different from the SB/LeMans to the AF/Suzuka. I think the length was fairly similar, so size may be similar, but the shape of the boot didn't agree with my feet. I decided to stick with the SB style boots.
That said, thermos might have solved all my problems, but I was more comfortable staying with what I knew. However, the OP said that the Raichles he has are killing him, so perhaps change is good in this case.