There are basically two bet scenarios in play using this method. You are at a disadvantage at both, so your "winning streak" is just a statistical anomoly at this point.
The first scenario encompasses the pass/don't pass bets; here you must remember that although these bets seem to cancel each other out, you will lose half your total stake every time a twelve rolls on the come out, as this is considered a push for the don't pass wager, and a loss for the pass wager. This gives you a $1 loss for every $72 of bets, or a house edge of 1.39%
And no, it's not against the rules to place both wagers (has basically the same house advantage as playing only one of the two bets).
The second bet, the lay bet, is independent of the pass/don't bets. Looking at the Wizard of Odds site, it seems that the house edge on a 4 or a 10 here is 2.44%.
So, I think your strategy has just been lucky so far.
A box lunch can be quite savory
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