Who cares about
PR rating.
PR rating is pointless and is meaningless besides just a quick reference to your Google strength. As far as how many backlinks you should get? 2 or 3 new per week is ridiculous. You might as well just stop doing
SEO work if you do that because its going to take you 6 months to get anywhere.
When I do
SEO work for customers, I target 20-30 high
pr backlinks per day and have never had any issue with sandboxing. Your issue is one of 3 reasons:
#1. Your not sandboxed, Google just had you in a dance until it figured out where to put you (this is the most common - about 80% of the cases).
#2. You are sandboxed because you created too many backlinks from low ranked sites via blogs or forums (about 10% of the cases).
#3. Google decided your site wasn't as relevant as others in that keyword (the remaining 10% of cases).
Sandboxing is pretty hard to do in this day in age. Imagine if I have something about Michael Jackson that no one else had. If I released it right now, I would get a boat-load of backlinks referring to my site/story.
Do you think Google would automatically sandbox me? Absolutely not. To prove this, let's backtrack at the Drudge Report back with Monica Lewinsky and Bill Clinton. This is exactly what happened with that and know way were they sandboxed.
Now, if you use Xrumer and get 50,000 backlinks in one day, day after day, then I would say, yes you are probably sandboxed.
The Fix?
Get 10-15 High
PR backlinks, ping them, and you should be back up without a problem. At this point Google needs to know you are trustworthy, and by having high
pr sites links to you shows this.