What Motivates you and what sends you spinning off course?
looking in the mirror motivates me
weighing myself every single morning
the good feeling of a good workout/run/cardio completed
trying on clothes that fit better
thinking of the summer time and looking fantastic in my bikini 

my boyfriend and the look on his face when i hit my goal weight
what sends me spinning off course?
easter candy and it is EVERYWHERE!  I wont even look at it or go near it.  If i buy one bag I know I will eat the entire thing.  Or sometimes I get sleepy (I have a sever hypothyroid/hashimoto's) so I will crave a nap but instead, I'll go to the gym.  I ALWAYS feel better!
How do you knuckle back down?
breathe - and remember how horrible you feel when you give into temptation versus how spectacular you feel when you do not cheat for a day... a week... and the results!!!!
Are you getting better at reading the signs and able to redirect yourself before falling off?
Yes - as soon as I feel myself getting weak I'll eat a sugar free pudding and I'll do some cardio.  Or I'll complain to a girlfriend who will always snap me back into the right mindset!  Not to mention - I'll look at pics of swim suits and how I want to look hot 
 
keep up the good work - this forum is helping me so much!!!  30 lbs to go!!!!