Sunshine,
As you probably know, I am not a big fan of chases (I might even have said that on this thread before), but I do try to be constructive/helpful nonetheless.
Looking at your strategy, you are blindly chasing the dog in the first game on the card, it will go through runs like this that you can't predict - inherently this is the danger of chases...two or three chase losses and you lose all of your winnings with a very large chance of ruin. Also, I noticed that your play size seemed to increase when you started winning (I think you went from 110 to 330) which shows a little too much confidence after too few plays. I would suggest trying not to "get rich quick", but if you had stuck at 110, you could have upped your wager size with each successive loss and given yourself an opportunity to "chase the chase"...
Obviously, the inherent danger is simply that you are at the mercy of statistics and like any Martingale-esque system, it is doomed for failure in the long run, people don't believe they will hit a run longer than 5 or 6 losses, but it is entirely possible no matter how much the numbers are in your favor, even a 60% system has an 1% chance of a 5 game losing streak. Blind betting (truly 50%) has a 3+% chance of the same.
Maybe I am being naive, but I don't think the books put a game at 1st rotation for many good reasons (if so, why Purdue vs Ark St???) If I am wrong and they really do this, my gut would be that when a huge line game with a (sorry to alumni) no-name school playing, I would avoid as they are probably clearing out chasers.
So to distill my thoughts...
(i) Chase low and increase after multiple losses to improve odds of recovery (or potentially accelerate ruin) or vice versa, chase high and pare back with each victory to minimize losses when they come and stay low until you hit another win. Lots of options.
(ii) Why not drastically decrease your odds of failure and develop simple system (with say...60+% historical) that typically generates only 1-2 plays per day max and chase that instead? Will decrease odds of ruin dramatically. Honestly though, if you develop a 60% historical system, just straight bet it and REALLY remove the risk of ruin...
Just out of interest, have you done any historical analysis on this? Be interested to see the long term history.
Sorry for hogging your thread, just wanted to get some middle of the night thoughts out there for you to think about.
Good luck
Oz