Two questions

I'm playing at a casino with the following rules:

6 decks
No Double after split
Can double on any two cards
Can only split once
No surrender, late or early
Dealer stands on soft 17
Aces can be split once and are then treated as double downs
Dealer checks for blackjack

I suspect these are rather unfavorable rules. However, on the other side, I'm ahead close to $6000 in just over 20 hours, spreading 10-500 aggressively (and probably inaccurately as I am still somewhat new to the game, about 6 months of play) with no heat. I'm using a basic Hi-Lo count.

I sense that I am getting very lucky in combination to spreading aggressively and playing good BS.

My two questions:

1) What is the casino edge with these rules?

2) How far are my results from expectation? Like should I just quit while I'm ahead?

Thanks for any comments.