Main Domain with 1 Add-On Domain and 3 Parked Domains

Hi,
As I didn't find any thread related to my recent problem I decided to post it here:
I use vBSEO and Zoint SEO. Some time ago, I changed my main domain. Then I set what I used to have as the main domain to be an Add-on one. Apart from that, I have three parked domains on the new main domain.

The problem is:
1- My previous main domain (the current add-on) has lost its Google page-rank (it used be have a rank of 4, but now it is ranked zero), while the new domain hasn't got its expected rank (it has a zero too).
2- My website used to be the first result of Google for some special keywords. It is no more so.

The content of my .htaccess placed in "forum" directory is:

Code:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^forum.MY CURENT MAIN DOMAIN.com$
RewriteRule ^(.*)$ http://forum.MY CURENT MAIN DOMAIN.com/$1 [R=301,L]
RewriteRule ^(sitemap.*\.(xml|txt)(\.gz)?)$ vbseo_sitemap/vbseo_getsitemap.php?sitemap=$1 [L]
#below is for zoints seo:
#RewriteRule ^([a-z0-9_\-]*-(f|all)[0-9]+(p[0-9]+|/index[0-9]*)?\.html)$
#forumdisplay.php/$1 [QSA,L]
#RewriteRule ^([a-z0-9_\-]*-(t|p)[0-9]+(p[0-9]+|/index[0-9]*)?\.html)$ #showthread.php/$1 [QSA,L]
# RewriteCond %{REQUEST_URI} !(index\.php|\.css) [NC]
# RewriteRule ^(archive|sitemap)/(.*)$ $1/index.php/$2 [QSA,L]

You should choose a single domain to use, and 301 redirect the others to it. You need one domain that you will use long-term (i.e. preferrably forever).

You should upgrade to vBSEO 3.0. If you forum is important to you, trust only the professional, fully supported vBSEO solution.