755 is adding executable permissions at each level (owner, group, and others). It would not give group or other users write capability. That is not necessary for log files and setting the CI service account to use that as a default is a security issue.
You've confirmed that the users are able to view the log files in read-only mode. Why do they need to edit it? I can't think of a reason for a need to edit a log file.
Getting back to what you want to do the correction permission setting would be 664 (owner and group have read/write while others have read only) or 666 (owner/group/other all have read/write). I think the only way to change the default is to have an admin set up the SAS CI Service Account to have a umask that sets default permissions to one of those schemes. Just understand that all files created by SAS CI (not just logs) will have this default permission set. Be careful.
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