Paradise $5+$1 SNG vs $10 +$1 SNG

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I have been playing the $5 +$1 tournaments for about 4 months. I play a few a week and have around 60 under my belt. My statistics seem a little unrealistic based on what I have read here. My ITM is 70%, and 50% of my money finishes are 1st place. MY ROI is about 120%. Based on this small sample, it would appear I'm crushing these tournaments, or is it just a case of having too small of a sample size and these numbers are unsustainable over the long haul? I have seen ROI numbers between 20% and 50% posted, so I guess I'm just having a hot streak. In fact the month of May WAS particularly hot. I won almost every SNG I played all month long.

So now I'm thinking of moving up to the $10 +$1 tournaments. That $50 1st place is much more appealing, and the fact that the rake is only 10% as opposed to 20% at the $5 tables means I don't need to do as good to beat the rake.

Based on my $5 results, am I ready to make the jump? Or do I need to play 500 more $5 SNG's before I have any statistics that are meaningful enough to determine if I am really a winning player at this level?

How about the competition? I can't imagine that my opponents at the $10 tables would be much tougher than the $5 tables. If I play the same way will I still be able to consistently finish in the money?

Any comments appreciated.