Fabrika,
AH doesnt model real WEP in all aircraft. Sometimes it models only the maximum allowed time at maximum RPM setting.
For the DB605A of the C.205's it was 2,600rpm (+/- 2%) at 1,30 ATA and about 6,000mt. From this point of view 5 minutes are acceptable.
AH aircraft with a real WEP (some US irons) lack a second level WEP indeed.