Was there ever a way found to prevent duplicate content in showthread.php (p= & t=)?

[gruffyserv]

Other than buying vBSEO, or upgrading to VB4 which may result in even more problems.

I never paid much attention to the duplicate content issue with showthread.php (accessed via post view or thread view, p= t= etc).

I just moved my vbulletin 3.8 forum from a subdirectory with a 301 from the /forum/ directory to the site root and my number of duplicate pages are now 3-4 times more which has become a big deal.

In webmaster tools my /forum/showthread.php?p= duplicates are shown along with ones off the site root /showthread.php?p= so needless to say this has resulted in a "Capital P" penalty and my rankings actually got killed before panda rolledout.

few people say when the old /forum/ dupes drop off eventually things should be back to normal, which may or may not be the case but they aren't dropping out 3 weeks later and just the same I'd like to eliminate the post view issue if possible.