I think you can probably get 220 kg anyway.
TL;DR yes, take one.
Personally, and only in relation to deadlifts, I found that once I started pulling 200+ kg regularly it was best to limit heavy DL to once every eight to 10 day's at least. Now, I prefer every 10 to 14 days.
Deloads are a good idea, and IMO even better if they're planned. Having to suddenly take one generally means you didn't get your recovery or training loads right (which has happened to me and probably everyone else here).