That is way too aggressive and you are not going to last long at any casino. You might as well put a sign onaround your neck saying I'm a new card counter. 15 unit spread is crazy.
I noticed you've only recently joined the WoO Forum this past Valentine's Day!
With regards your question, I don't have that much experience playing blackjack,
I would recommend you read through 3 articles posted by Romes:
And to top that, if you're trying to get feedback from other forum posters, you'll get a LOT more replies by posting a THREAD vice a BLOG (blog readership is much, much lower than THREADS).
I might venture a reply to your question when I get more experience.
Before you stop the presses and post a THREAD (to get more feedback), your experienced fellow blackjack players can give you much, much more detailed feedback if you provide them with the following information:
1. Session bankroll
2. Spread (you can still use the one you "blogged")
3. Specify flavor of blackjack: 1D, 2DD, 6DD and the payout 3:2? 6:5? (oh no!). Hopefully, they are not CSM tables (counting is relatively useless).
4. What is your EV?
5. What is the PEN at the table(s) you are playing?
Wish I had the experience to guide you better, but I don't. The 5 questions I listed are what you'll come across time and again in the 3 articles of Romes.
And don't forget VARIANCE. You could play perfect strategy, and be the supreme card-counter, but there are those times when the dealer seems to get all the blackjacks, or squeezes ahead of your count by 1 measly point.