A bit more info, please...
Since David Spence is probably more accurate than I was on the TC's at which to bet, let's start by assuming his numbers are reasonable: that you'll need a TC of +5 or more to place the bet. I assume you'll be placing your max bet if the TC is +5 & up, so that simplifies things a bit.
First question: what is the ratio of your (single) Streak bet to your max bet? If you place more than one Streak bet simultaneously, are they all the same? For example, if your max bet is $100, and you place $5 each on the 3, 4, and 5 Streak bets, then tell me the ratio is 1/20 ($5/$100).
Second question: how are splits with double downs handled? According to information I saw on playing Streak in SD (see link below), if the player wins the majority of the splits, the Streak advances; if the house wins the majority, the Streak ends. Does doubling down affect this? Say you split 9's vs. the dealer's 5. The first 9 gets a 10, so you stand on 19. The second 9 gets a 2, so you DD and draw an Ace... that's what I always seem to get :-(. The dealer then draws to 18. Now you've won one of your split hands and lost the other, so is this a push for the Streak? Or is it a loss, since overall you've lost one bet? I ask because the SD info implies that this situation is a push (player won one wager and lost the other), but the Wizard of Odds appears to treat this a a loss (player's overall result for the hand was -1 bet).
Third question: if the player is dealt a BJ vs. the dealer's Ace, the player elects to take even money, and the dealer subsequently has a BJ of her own, does this advance the Streak, or is it simply a push? The SD info implies "push", and the WOO is mum on the subject, so I suspect "push" is the correct answer.
The reason I ask these questions is that the answers may have an effect on the optimum strategy for playing BJ+Streak. As I pointed out before, if your Streak bet is a significant fraction of (or even equal to or larger than) your BJ bet, you'll have to play more conservatively, especially on DD. As for splits, we may find that certain strange-looking splits might become B.S. For example, splitting 7's vs. an 8 might make sense, since if you don't split, your chances of winning with 14 vs. 8 are slim, but if you do split, your chances of getting an overall push (or even win) AND THUS PRESERVING (OR ADVANCING) YOUR STREAK BET(S) might make the split worthwhile. As for taking even money, if you can advance your Streak bet (or even win it) by doing so, then even money becomes much, MUCH more attractive.
Let me know these answers, and I'll see what I can determine.