Expectation

[dopp16]

Now, I am a winning player at both fixed and no-limit levels, I have been concentrating on the S&G's for the last 2 months and have been on an incredible, almost unrealistic upswing. Playing only 22, 33, and 35 Sit and Go's I have made over 2500 dollars in the last month and a half including 11 straight ITM at one point. Is this a realistic expectation or should I expect a negative variance. I am almost timid to move up to the 50 and 100's because I have had so much success, is that a negative? I have only been playing S&G's consistently for about a year and dont want to bite off more than I can chew. Comments?