Readjusting to lighter irons?

I recently got a new set of irons. It turns out they're a decent bit lighter than my old set. About 20g on average.

Swing weight is about the same if not a bit higher on the new irons though.

My first range session with the new set, and I was hitting them beautifully. Consistent contact, great distance and dispersion, no issues whatsoever.

But after around, and a few more range sessions, suddenly I'm slicing and casting the hell out of these irons. It's really frustrating.

I could chalk it up to a couple bad days, but I also can't help but suspect that the lighter weight may be causing some of the problems with my tempo and timing.

I'm going to focus on practicing and making some tweaks to my swing and see if these new irons will start to cooperate again.

But I was curious to get feedback and advice from people who may have made a similar weight change. How long did it take you to readjust?