During that time the puzzles had like 0.0064 bitcoin it and on top of that BTC was very low. Why would it create a world wide bot race and why would someone waste hundreds or thousands of dollars in fees to withdraw it?
It only became an issue once the creator increased the puzzle prize and since then, no lower end puzzle have been solved.

I suggest to take whatever time/scripts/motivation you have and try to solve puzzle #80 on wards instead where you will be guaranteed the prize.
Or, ask someone with knowledge about timings which is the lowest feasible puzzle to be solved that will leave enough time to withdraw without a bot snatchingup. I don't know this answer, could be even puzzle #70?  

If someone can answer that, that would be great.