Well, I'll be damned. I apologize.
If you're dealing with clunking issues already, and on an ST nonetheless, I'd say that's pretty convincing evidence that the reinforced strut tower is a necessity. I'd contact FordCustomerService on here and get your problems documented ASAP.
Also, please fill out this survey: https://docs.google.com/spreadsheet/...lUekE6MQ#gid=0