Forcing 644 Permissions on Files with ProFTPd

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http://serverfault.com – We have an Ubuntu 12.04 server set up with ProFTPd for users to upload files. Each user has their own account and are jailed to their directory. Normally, everything works fine, they get 644 permissions on created/uploaded files, and 755 permissions on created/uploaded folders. The problem is, occasionally some files will get uploaded with 600 permissions (or changed after uploading, I'm not sure?), so they are not readable to anyone but the owner. Is there any way to lock/force permissions to 644 on files? I know I can take away permissions with umask but I don't want this, I want to stop (HowTos)