No, it didn't! 
The halving in 2016 was in July, we had just a 5% drop in August.
The May halving difficulty history looks like this:
so a bit harder to find a pattern there, oh, the adjustment wasn't on the -15.95 it was on the -6 

I seriously don't understand on what you base your recovery enthusiasms, other than maybe being completely bullish on the price, miners don't care about charts, we care about income per $ spent on electricity, and this I how it looks now:
The best of the gear launched now and available makes you 11$, burns 84kwh and costs 6k,2 years ROI on zero costs.

I was pretty bullish on the growth myself, but the end of Q2 is coming and a lot of contracts will probably expire, only the big guy with dirt-cheap energy will keep on mining.

Also, in terms of network security it's the same in both cases:
300 exahash when the bets gear was the 19 with 100th/3kwh and $5000
600 exahash when the best gear is the s21 with 200th/3kw and priced at $5000

Hashrate without the cost per th/s and the amount protected is a bit meaningless!