My thinking is a huge whale has already tried unsuccessfully. I'd say in the beginning of January was a good time. But we're almost at the end of Jan 31 and other then China and FBI's BTC is the only predicted bad news on the horizon. So there's a higher chance now that BTC will go up 20+% in those 6 weeks in which you may not get your withdrawal.
We'll see. If 20% rise happens, then just the rest of my BTC will work for me. Anyway what bitcoin learned me is that "news based trade" simply does not work. Personally I think BTC is still overvalued and it won't rise rapidly.