New TA/Charting, page-13525

I agree 78.6% is an important retracement level within the LTR chart. I actually remember some other chartist who is always full of good advice, trying to convince me that 78.6% isn't a true Fib level.
However the trick with Fib levels is that they need to be applied correctly, meaning the low of the wave within the trend which in turn goes hand in hand with knowing the correct wave count within the overall trend, which is where you might be somewhat off.

However if you are convinced 72c or there about is your target, so be it. Maybe you put your buy order in now, because I would think your position in line would be important to get any shares at that price. Good luck though!