For a 30% increase in diff, network need a minimum of 50T of new hashing power. Not very likely in next 10 days.
Anyway, nice effort on your part. How are you calculating the data? Is there some webpage with calculations, or are you pulling data from blockchain?
10 Minirigs per day = 50 Th/s in 10 days. There's Avalon, ASICMiner, and BFL units coming online. Between the 3 of them, 50 Th/s over the next 10 days is certainly a possibility.
As for the data I'm using, it's just taken from
http://bitcoincharts.com/Also, my estimate will be based off the data I post here. That initial 30% guess is based on observations of the data over the past few days. We'll be able to see how it's progressing over the next few data points though.