Correct. You need tapered edges. Unless you can force a one-size smaller hose on it, it's going to leak. For instance, if you can force a 5/8" hose on a 3/4" PEX fitting, it won't leak, but I'm pretty sure it either won't go on or it will be the tightest fit ever.
Also, lol at "perforated edges". Not the word you were looking for.
1992 Eagle Talon TSi - sold (POS)
2002 Mustang GT - sold
2002 SVTF - sold
2008.5 Mazdaspeed3 GT - cursed
2003 350Z Track - basically stock, and it runs