I suspect you're trying to force all 52 characters into the Palm Database Name. Don't do that. Palm Db names have to be 32 bytes or less (it doesn't matter if your title is longer than that). Put the full title in an EXTH record (type 503). Devices/apps will use that for the metadata. They will only fall back on the Palm database name if there is no full title elsewhere in the mobi.
“Politics: A strife of interests masquerading as a contest of principles. The conduct of public affairs for private advantage.”