We have a file with 795 characters per line in JES2 and when it gets to CA Spool the columns are cut off at about 256 characters.
Release : 12.0 14.0
Component : CA Spool
The general ESFPARM XFEROPT=13 may be the solution.
XFEROPT=13 -- Files with an LRECL greater than 253 retain their original LRECL value even if they do not have PRMODE=PAGE.