It is often difficult to closely monitor crash recoveries, as intraday data is often not available. Fortunately OANDA keep over 2 years of hourly data, so I have been able to overlay the ES futures (23h a day) price/action from the Feb 2018 crash and the final part of that in December 2018, both of similar percentages. There is a good match to both at the moment, but I think the Feb 18 one is a bit closer. Anyway, this chart will pan out for definite shortly.
Trade
SELL 3089 MARKET
SL 3150
TP 2885
RR 3.95