I would keep the intel bullitin stacking, since it gives you for only 1 unit the stack. So don't remove it. Like 3x 5% increase armour for a Pz4 gives you only the good stuff of the pz4 nothing more. This means you'll have to go into pz4 to get maximum quality of your selection.
Do you Stack the "Hungry Like the Bears" Intel Bulletin for the UK Commandos? Rumor has it that the bulletin was named for the Bears Clan.