My father taught me the most important lesson I ever learned about betting horses. Don't bet the horse, bet the odds board.
Example: If you handicap a horse to win and the horse is even money, forget him, find a better bet, even if you know the even money shot is going to win.
I've been betting horses, and winning, since I was 12, about 42 years ago. This is the best lesson I ever learned.
It doesn't answer the handicapping question (current form, curren class, current success of connections) but it may help in winning more money, and I think that's what you are looking for.