eurusdzn is right. You should grow your capital gradually. For $2k, I would trade $10k lots for $4k,$20k lot.
I would probably loose sleep if i doubled my position size on my futures and options accounts...well not really...
There is a big psychological factor managing increasing amounts of money. Include the financial obligations born out of your trading enterprise. That's a lot on your shoulders all at the same time.
If you are as consistent as you claim, then there is no need to rush further unless you are exploiting an anomaly that may vanish.
My best year for capital buildup was when I switched from Starbucks to Sanka.