Wait, yesterday it was 1.020 but today it is 1.030? Should not be going up.
Fermentation takes normally a week to complete. Even if there is no air lock bubbles the beer can still be fermenting. Don't add any new yeast, just let it go and do its thing. If you get the same gravity reading 3 days in a row then the fermentation is probably done.
You said white lab, can you tell us which yeast specifically it was?
You also said you doubled your DME and yeast, but are only at 1.052 (you wrote 1.502, I assume it is 1.052), which would have made a normal recipe be at a 1.026 OG, which seems really low. Something doesn't add up, perhaps you read your OG wrong.
So I would suggest you just let it sit and ferment out, if by the end of the week it hasn't changed then come back and work on it.