Just turned pro got a couple questions?

[Toerazor]

Hello. I just started playing poker a living about a month and a half ago. I started playing the 20 SNG on Full Tilt and have now moved up to the 30 SNG and a couple 50's. I have been reading alot about attainable ROI and was wondering if I have just been running good and if so what is to be expected at those levels mainly the 30 and 50's. I am also playing the normal ones not the Turbos.

My ROI is 35%. My avg profit per game is $10 and my total profit is 3300 over about 350 games. Also I keep 50 buy ins for each level and have heard of 20 buy in downswings and was wondering if I should up the amount of buy ins to 75 or 100. You can sharkscope me for more details under Toerazor I play on Full Tilt. Thanks for all your help much appreciated. Keep grindin.